\n
address_offset : 0x0 Bytes (0x0)
size : 0x90 byte (0x0)
mem_usage : registers
protection :
address_offset : 0x100 Bytes (0x0)
size : 0x10 byte (0x0)
mem_usage : registers
protection :
RTC Initiation Register
address_offset : 0x0 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
INIT_ACTIVE : RTC Active Status (Read Only)
bits : 0 - 0 (1 bit)
access : read-only
Enumeration:
#0 : 0
RTC is at reset state
#1 : 1
RTC is at normal active state
End of enumeration elements list.
INIT : RTC Initiation
When RTC block is powered on, RTC is at reset state. User has to write a number (0x a5eb1357) to INIT to make RTC leaving reset state. Once the INIT is written as 0xa5eb1357, the RTC will be in un-reset state permanently.
The INIT is a write-only field and read value will be always 0.
bits : 1 - 31 (31 bit)
access : read-write
RTC Calendar Loading Register
address_offset : 0x10 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
DAY : 1-Day Calendar Digit (0~9)
bits : 0 - 3 (4 bit)
access : read-write
TENDAY : 10-Day Calendar Digit (0~3)
bits : 4 - 5 (2 bit)
access : read-write
MON : 1-Month Calendar Digit (0~9)
bits : 8 - 11 (4 bit)
access : read-write
TENMON : 10-Month Calendar Digit (0~1)
bits : 12 - 12 (1 bit)
access : read-write
YEAR : 1-Year Calendar Digit (0~9)
bits : 16 - 19 (4 bit)
access : read-write
TENYEAR : 10-Year Calendar Digit (0~9)
bits : 20 - 23 (4 bit)
access : read-write
RTC 32.768 KHz Oscillator Control Register
address_offset : 0x100 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
LXTEN : Backup Domain 32K Oscillator Enable Bit
Note: This bit controls 32 kHz oscillator on/off. User can set either LXTEN in RTC battery power domain or system manager control register CLK_PWRCTL[1] (LXTEN) to enable 32 kHz oscillator. If this bit is set 1, X32 kHz oscillator keeps running after system core power is turned off if this bit is cleared to 0, the oscillator is turned off when system core power is turned off.
bits : 0 - 0 (1 bit)
access : read-write
Enumeration:
#0 : 0
Oscillator Disabled
#1 : 1
Oscillator Enabled
End of enumeration elements list.
GAIN : Oscillator Gain Option
User can select oscillator gain according to crystal external loading and operating temperature range. The larger gain value corresponding to stronger driving capability and higher power consumption.
bits : 1 - 3 (3 bit)
access : read-write
Enumeration:
#000 : 0
L0 mode
#001 : 1
L1 mode
#010 : 2
L2 mode
#011 : 3
L3 mode
#100 : 4
L4 mode
#101 : 5
L5 mode
#110 : 6
L6 mode
#111 : 7
L7 mode (Default)
End of enumeration elements list.
X32KO Pin Control Register
address_offset : 0x104 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
OPMODE : GPF0 Operation Mode
bits : 0 - 1 (2 bit)
access : read-write
Enumeration:
#00 : 0
X32KO (PF.0) is input only mode, without pull-up resistor
#01 : 1
X32KO (PF.0) is output push pull mode
#10 : 2
X32KO (PF.0) is open drain mode
#11 : 3
X32KO (PF.0) is input only mode with internal pull up
End of enumeration elements list.
DOUT : IO Output Data
bits : 2 - 2 (1 bit)
access : read-write
Enumeration:
#0 : 0
X32KO (PF.0) output low
#1 : 1
X32KO (PF.0) output high
End of enumeration elements list.
CTLSEL : IO Pin State Backup Selection
When low speed 32 kHz oscillator is disabled, X32KO (PF.0) pin can be used as GPIO function. User can program CTLSEL bit to decide X32KO (PF.0) I/O function is controlled by system power domain GPIO module or VBAT power domain RTC_LXTOCTL control register.
bits : 3 - 3 (1 bit)
access : read-write
Enumeration:
#0 : 0
X32KO (PF.0) pin I/O function is controlled by GPIO module. It becomes floating when system power is turned off
#1 : 1
X32KO (PF.0) pin I/O function is controlled by VBAT power domain, X32KO (PF.0) pin function and I/O status are controlled by OPMODE[1:0] and DOUT after CTLSEL it set to 1. I/O pin keeps the previous state after system power is turned off
End of enumeration elements list.
X32KI Pin Control Register
address_offset : 0x108 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
OPMODE : IO Operation Mode
bits : 0 - 1 (2 bit)
access : read-write
Enumeration:
#00 : 0
X32KI (PF.1) is input only mode, without pull-up resistor
#01 : 1
X32KI (PF.1) is output push pull mode
#10 : 2
X32KI (PF.1) is open drain mode
#11 : 3
X32KI (PF.1) is input only mode with internal pull up
End of enumeration elements list.
DOUT : IO Output Data
bits : 2 - 2 (1 bit)
access : read-write
Enumeration:
#0 : 0
X32KI (PF.1) output low
#1 : 1
X32KI (PF.1) output high
End of enumeration elements list.
CTLSEL : IO Pin State Backup Selection
When low speed 32 kHz oscillator is disabled, X32KI (PF.1) pin can be used as GPIO function. User can program CTLSEL bit to decide X32KI (PF.1) I/O function is controlled by system power domain GPIO module or VBAT power domain RTC_LXTICTL control register.
bits : 3 - 3 (1 bit)
access : read-write
Enumeration:
#0 : 0
X32KI (PF.1) pin I/O function is controlled by GPIO module. It becomes floating state when system power is turned off
#1 : 1
X32KI (PF.1) pin I/O function is controlled by VBAT power domain, X32KI (PF.1) pin function and I/O status are controlled by OPMODE[1:0] and DOUT after CTLSEL it set to 1. I/O pin keeps the previous state after system power is turned off
End of enumeration elements list.
TAMPER Pin Control Register
address_offset : 0x10C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
OPMODE : IO Operation Mode
bits : 0 - 1 (2 bit)
access : read-write
Enumeration:
#00 : 0
TAMPER (PF.2) is input only mode, without pull-up resistor
#01 : 1
TAMPER (PF.2) is output push pull mode
#10 : 2
TAMPER (PF.2) is open drain mode
#11 : 3
TAMPER (PF.2) is input only mode with internal pull up
End of enumeration elements list.
DOUT : IO Output Data
bits : 2 - 2 (1 bit)
access : read-write
Enumeration:
#0 : 0
TAMPER (PF.2) output low
#1 : 1
TAMPER (PF.2) output high
End of enumeration elements list.
CTLSEL : IO Pin State Backup Selection
When tamper function is disabled, TAMPER pin can be used as GPIO function. User can program CTLSEL bit to decide PF.2 I/O function is controlled by system power domain GPIO module or VBAT power domain RTC_TAMPCTL control register.
bits : 3 - 3 (1 bit)
access : read-write
Enumeration:
#0 : 0
TAMPER (PF.2) I/O function is controlled by GPIO module. It becomes floating state when system power is turned off
#1 : 1
TAMPER (PF.2) I/O function is controlled by VBAT power domain. PF.2 function and I/O status are controlled by OPMODE[1:0] and DOUT after CTLSEL it set to 1. I/O pin state keeps previous state after system power is turned off
End of enumeration elements list.
RTC Time Scale Selection Register
address_offset : 0x14 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
_24HEN : 24-hour / 12-hour Time Scale Selection
Indicates that RTC_TIME and RTC_TALM are in 24-hour time scale or 12-hour time scale
bits : 0 - 0 (1 bit)
access : read-write
Enumeration:
#0 : 0
12-hour time scale with AM and PM indication selected
#1 : 1
24-hour time scale selected
End of enumeration elements list.
RTC Day of the Week Register
address_offset : 0x18 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
WEEKDAY : Day of the Week Register
bits : 0 - 2 (3 bit)
access : read-write
Enumeration:
#000 : 0
Sunday
#001 : 1
Monday
#010 : 2
Tuesday
#011 : 3
Wednesday
#100 : 4
Thursday
#101 : 5
Friday
#110 : 6
Saturday
#111 : 7
Reserved.
End of enumeration elements list.
RTC Time Alarm Register
address_offset : 0x1C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
SEC : 1-Sec Time Digit of Alarm Setting (0~9)
bits : 0 - 3 (4 bit)
access : read-write
TENSEC : 10-Sec Time Digit of Alarm Setting (0~5)
bits : 4 - 6 (3 bit)
access : read-write
MIN : 1-Min Time Digit of Alarm Setting (0~9)
bits : 8 - 11 (4 bit)
access : read-write
TENMIN : 10-Min Time Digit of Alarm Setting (0~5)
bits : 12 - 14 (3 bit)
access : read-write
HR : 1-Hour Time Digit of Alarm Setting (0~9)
bits : 16 - 19 (4 bit)
access : read-write
TENHR : 10-hour Time Digit of Alarm Setting (0~2)
When RTC runs as 12-hour time scale mode, the high bit of TENHR (RTC_TIME[21]) means AM/PM indication.
bits : 20 - 21 (2 bit)
access : read-write
RTC Calendar Alarm Register
address_offset : 0x20 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
DAY : 1-Day Calendar Digit of Alarm Setting (0~9)
bits : 0 - 3 (4 bit)
access : read-write
TENDAY : 10-Day Calendar Digit of Alarm Setting (0~3)
bits : 4 - 5 (2 bit)
access : read-write
MON : 1-Month Calendar Digit of Alarm Setting (0~9)
bits : 8 - 11 (4 bit)
access : read-write
TENMON : 10-Month Calendar Digit of Alarm Setting (0~1)
bits : 12 - 12 (1 bit)
access : read-write
YEAR : 1-Year Calendar Digit of Alarm Setting (0~9)
bits : 16 - 19 (4 bit)
access : read-write
TENYEAR : 10-Year Calendar Digit of Alarm Setting (0~9)
bits : 20 - 23 (4 bit)
access : read-write
RTC Leap Year Indicator Register
address_offset : 0x24 Bytes (0x0)
size : -1 bit
access : read-only
reset_value : 0x0
reset_Mask : 0x0
LEAPYEAR : Leap Year Indication Register (Read Only)
bits : 0 - 0 (1 bit)
access : read-only
Enumeration:
#0 : 0
This year is not a leap year
#1 : 1
This year is leap year
End of enumeration elements list.
RTC Interrupt Enable Register
address_offset : 0x28 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
ALMIEN : Alarm Interrupt Enable Bit
bits : 0 - 0 (1 bit)
access : read-write
Enumeration:
#0 : 0
RTC Alarm interrupt Disabled
#1 : 1
RTC Alarm interrupt Enabled
End of enumeration elements list.
TICKIEN : Time Tick Interrupt Enable Bit
bits : 1 - 1 (1 bit)
access : read-write
Enumeration:
#0 : 0
RTC Time Tick interrupt Disabled
#1 : 1
RTC Time Tick interrupt Enabled
End of enumeration elements list.
SNPDIEN : Snoop Detection Interrupt Enable Bit
bits : 2 - 2 (1 bit)
access : read-write
Enumeration:
#0 : 0
Snoop detected interrupt Disabled
#1 : 1
Snoop detected interrupt Enabled
End of enumeration elements list.
RTC Interrupt Indicator Register
address_offset : 0x2C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
ALMIF : RTC Alarm Interrupt Flag
When RTC time counters RTC_TIME and RTC_CAL match the alarm setting time registers RTC_TALM and RTC_CALM, this bit will be set to 1 and an interrupt will be generated if RTC Alarm Interrupt enabled ALMIEN (RTC_INTEN[0]) is set to 1. Chip will be woken up if RTC Alarm Interrupt is enabled when chip is at Power-down mode.
Note: Write 1 to clear this bit.
bits : 0 - 0 (1 bit)
access : read-write
Enumeration:
#0 : 0
Alarm condition is not matched
#1 : 1
Alarm condition is matched
End of enumeration elements list.
TICKIF : RTC Time Tick Interrupt Flag
When RTC time tick happened, this bit will be set to 1 and an interrupt will be generated if RTC Tick Interrupt enabled TICKIEN (RTC_INTEN[1]) is set to 1. Chip will also be woken up if RTC Tick Interrupt is enabled and this bit is set to 1 when chip is running at Power-down mode.
Note: Write 1 to clear to clear this bit.
bits : 1 - 1 (1 bit)
access : read-write
Enumeration:
#0 : 0
Tick condition does not occur
#1 : 1
Tick condition occurs
End of enumeration elements list.
SNPDIF : Snoop Detect Interrupt Flag
When tamper pin transition event is detected, this bit is set to 1 and an interrupt is generated if Snoop Detection Interrupt enabled SNPDIEN (RTC_INTEN[2]) is set to1. Chip will be woken up from Power-down mode if spare register snooper detect interrupt is enabled.
Note: Write 1 to clear this bit.
bits : 2 - 2 (1 bit)
access : read-write
Enumeration:
#0 : 0
No snoop event is detected
#1 : 1
Snoop event is detected
End of enumeration elements list.
RTC Time Tick Register
address_offset : 0x30 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
TICK : Time Tick Register
These bits are used to select RTC time tick period for Periodic Time Tick Interrupt request.
Note: This register can be read back after the RTC register access enable bit RWENF (RTC_RWEN[16]) is active.
bits : 0 - 2 (3 bit)
access : read-write
Enumeration:
#000 : 0
Time tick is 1 second
#001 : 1
Time tick is 1/2 second
#010 : 2
Time tick is 1/4 second
#011 : 3
Time tick is 1/8 second
#100 : 4
Time tick is 1/16 second
#101 : 5
Time tick is 1/32 second
#110 : 6
Time tick is 1/64 second
#111 : 7
Time tick is 1/28 second
End of enumeration elements list.
RTC Time Alarm Mask Register
address_offset : 0x34 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
MSEC : Mask 1-Sec Time Digit of Alarm Setting (0~9)
bits : 0 - 0 (1 bit)
access : read-write
MTENSEC : Mask 10-Sec Time Digit of Alarm Setting (0~5)
bits : 1 - 1 (1 bit)
access : read-write
MMIN : Mask 1-Min Time Digit of Alarm Setting (0~9)
bits : 2 - 2 (1 bit)
access : read-write
MTENMIN : Mask 10-Min Time Digit of Alarm Setting (0~5)
bits : 3 - 3 (1 bit)
access : read-write
MHR : Mask 1-Hour Time Digit of Alarm Setting (0~9)
bits : 4 - 4 (1 bit)
access : read-write
MTENHR : Mask 10-Hour Time Digit of Alarm Setting (0~2)
bits : 5 - 5 (1 bit)
access : read-write
RTC Calendar Alarm Mask Register
address_offset : 0x38 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
MDAY : Mask 1-Day Calendar Digit of Alarm Setting (0~9)
bits : 0 - 0 (1 bit)
access : read-write
MTENDAY : Mask 10-Day Calendar Digit of Alarm Setting (0~3)
bits : 1 - 1 (1 bit)
access : read-write
MMON : Mask 1-Month Calendar Digit of Alarm Setting (0~9)
bits : 2 - 2 (1 bit)
access : read-write
MTENMON : Mask 10-Month Calendar Digit of Alarm Setting (0~1)
bits : 3 - 3 (1 bit)
access : read-write
MYEAR : Mask 1-Year Calendar Digit of Alarm Setting (0~9)
bits : 4 - 4 (1 bit)
access : read-write
MTENYEAR : Mask 10-Year Calendar Digit of Alarm Setting (0~9)
bits : 5 - 5 (1 bit)
access : read-write
RTC Spare Functional Control Register
address_offset : 0x3C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
SNPDEN : Snoop Detection Enable Bit
bits : 0 - 0 (1 bit)
access : read-write
Enumeration:
#0 : 0
TAMPER pin detection Disabled
#1 : 1
TAMPER pin detection Enabled
End of enumeration elements list.
SNPTYPE0 : Snoop Detection Level
This bit controls TAMPER detect event is high level/rising edge or low level/falling edge.
bits : 1 - 1 (1 bit)
access : read-write
Enumeration:
#0 : 0
Low level/Falling edge detection
#1 : 1
High level/Rising edge detection.
End of enumeration elements list.
SPRRWEN : Spare Register Enable Bit
Note: When spare register is disabled, RTC_SPR0 ~ RTC_SPR19 cannot be accessed.
bits : 2 - 2 (1 bit)
access : read-write
Enumeration:
#0 : 0
Spare register Disabled
#1 : 1
Spare register Enabled
End of enumeration elements list.
SNPTYPE1 : Snoop Detection Mode
This bit controls TAMPER pin is edge or level detection
bits : 3 - 3 (1 bit)
access : read-write
Enumeration:
#0 : 0
Level detection
#1 : 1
Edge detection
End of enumeration elements list.
SPRCSTS : SPR Clear Flag
This bit indicates if the RTC_SPR0 ~RTC_SPR19 content is cleared when specify snoop event is detected.
Writes 1 to clear this bit.
bits : 5 - 5 (1 bit)
access : read-write
Enumeration:
#0 : 0
Spare register content is not cleared
#1 : 1
Spare register content is cleared
End of enumeration elements list.
SPRRWRDY : SPR Register Ready
This bit indicates if the registers RTC_SPRCTL, RTC_SPR0 ~ RTC_SPR19 are ready to be accessed.
After user writing registers RTC_SPRCTL, RTC_SPR0 ~ RTC_SPR19, read this bit to check if these registers are updated done is necessary.
Note: This bit is read only and any write to it won't take any effect.
bits : 7 - 7 (1 bit)
access : read-write
Enumeration:
#0 : 0
RTC_SPRCTL, RTC_SPR0 ~ RTC_SPR19 updating is in progress
#1 : 1
RTC_SPRCTL, RTC_SPR0 ~ RTC_SPR19 are updated done and ready to be accessed
End of enumeration elements list.
RTC Access Enable Register
address_offset : 0x4 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RWEN : RTC Register Access Enable Password (Write Only)
Writing 0xA965 to this register will enable RTC access and keep 1024 RTC clock.
bits : 0 - 15 (16 bit)
access : write-only
RWENF : RTC Register Access Enable Flag (Read Only)
This bit will be set after RTC_RWEN[15:0] register is load a 0xA965, and be cleared automatically after 1024 RTC clock.
bits : 16 - 16 (1 bit)
access : read-only
Enumeration:
#0 : 0
RTC register read/write Disabled
#1 : 1
RTC register read/write Enabled
End of enumeration elements list.
RTC Spare Register 0
address_offset : 0x40 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
SPARE : Spare Register
This field is used to store back-up information defined by user.
This field will be cleared by hardware automatically once a snooper pin event is detected.
Before storing back-up information in to RTC_SPRx register, user should write 0xA965 to RTC_RWEN[15:0] to make sure register read/write enable bit REWNF (RTC_RWEN[16]) is enabled.
bits : 0 - 31 (32 bit)
access : read-write
RTC Spare Register 1
address_offset : 0x44 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 2
address_offset : 0x48 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 3
address_offset : 0x4C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 4
address_offset : 0x50 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 5
address_offset : 0x54 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 6
address_offset : 0x58 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 7
address_offset : 0x5C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 8
address_offset : 0x60 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 9
address_offset : 0x64 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 10
address_offset : 0x68 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 11
address_offset : 0x6C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 12
address_offset : 0x70 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 13
address_offset : 0x74 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 14
address_offset : 0x78 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 15
address_offset : 0x7C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Frequency Compensation Register
address_offset : 0x8 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
FRACTION : Fraction Part
Note: Digit in RTC_FREQADJ must be expressed as hexadecimal number.
bits : 0 - 5 (6 bit)
access : read-write
INTEGER : Integer Part
bits : 8 - 11 (4 bit)
access : read-write
RTC Spare Register 16
address_offset : 0x80 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 17
address_offset : 0x84 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 18
address_offset : 0x88 Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Spare Register 19
address_offset : 0x8C Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
RTC Time Loading Register
address_offset : 0xC Bytes (0x0)
size : -1 bit
access : read-write
reset_value : 0x0
reset_Mask : 0x0
SEC : 1-Sec Time Digit (0~9)
bits : 0 - 3 (4 bit)
access : read-write
TENSEC : 10-Sec Time Digit (0~5)
bits : 4 - 6 (3 bit)
access : read-write
MIN : 1-Min Time Digit (0~9)
bits : 8 - 11 (4 bit)
access : read-write
TENMIN : 10-Min Time Digit (0~5)
bits : 12 - 14 (3 bit)
access : read-write
HR : 1-Hour Time Digit (0~9)
bits : 16 - 19 (4 bit)
access : read-write
TENHR : 10-hour Time Digit (0~2)
When RTC runs as 12-hour time scale mode, RTC_TIME[21] (the high bit of TENHR[1:0]) means AM/PM indication. (If RTC_TIME[21] is 1, it indicates PM time message.)
bits : 20 - 21 (2 bit)
access : read-write
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