SAM3XA RTC
Real-time Clock (RTC) User Interface
Registers
Address | Register | Name | Access | Reset |
---|---|---|---|---|
0x400E1A60 | Control Register | RTC_CR | read-write | 0x00000000 |
0x400E1A64 | Mode Register | RTC_MR | read-write | 0x00000000 |
0x400E1A68 | Time Register | RTC_TIMR | read-write | 0x00000000 |
0x400E1A6C | Calendar Register | RTC_CALR | read-write | 0x01210720 |
0x400E1A70 | Time Alarm Register | RTC_TIMALR | read-write | 0x00000000 |
0x400E1A74 | Calendar Alarm Register | RTC_CALALR | read-write | 0x01010000 |
0x400E1A78 | Status Register | RTC_SR | read-only | 0x00000000 |
0x400E1A7C | Status Clear Command Register | RTC_SCCR | write-only | - |
0x400E1A80 | Interrupt Enable Register | RTC_IER | write-only | - |
0x400E1A84 | Interrupt Disable Register | RTC_IDR | write-only | - |
0x400E1A88 | Interrupt Mask Register | RTC_IMR | read-only | 0x00000000 |
0x400E1A8C | Valid Entry Register | RTC_VER | read-only | 0x00000000 |
0x400E1B44 | Write Protect Mode Register | RTC_WPMR | read-write | 0x00000000 |
Register Fields
RTC Control Register
Name: RTC_CR
Access: read-write
Address: 0x400E1A60
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | CALEVSEL | |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | TIMEVSEL | |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | - | - | - | UPDCAL | UPDTIM |
- UPDTIM: Update Request Time Register
Value Name Description 0 - No effect. 1 - Stops the RTC time counting. - UPDCAL: Update Request Calendar Register
Value Name Description 0 - No effect. 1 - Stops the RTC calendar counting. - TIMEVSEL: Time Event Selection
Value Name Description 0x0 MINUTE Minute change 0x1 HOUR Hour change 0x2 MIDNIGHT Every day at midnight 0x3 NOON Every day at noon - CALEVSEL: Calendar Event Selection
Value Name Description 0x0 WEEK Week change (every Monday at time 00:00:00) 0x1 MONTH Month change (every 01 of each month at time 00:00:00) 0x2 YEAR Year change (every January 1 at time 00:00:00)
RTC Mode Register
Name: RTC_MR
Access: read-write
Address: 0x400E1A64
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | - | - | - | - | HRMOD |
- HRMOD: 12-/24-hour Mode
Value Name Description 0 - 24-hour mode is selected. 1 - 12-hour mode is selected.
RTC Time Register
Name: RTC_TIMR
Access: read-write
Address: 0x400E1A68
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | AMPM | HOUR | |||||
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | MIN | ||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | SEC |
- SEC: Current Second
- MIN: Current Minute
- HOUR: Current Hour
- AMPM: Ante Meridiem Post Meridiem Indicator
Value Name Description 0 - AM. 1 - PM.
-
-
-
RTC Calendar Register
Name: RTC_CALR
Access: read-write
Address: 0x400E1A6C
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | DATE | |||||
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
DAY | MONTH | ||||||
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
YEAR | |||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | CENT |
- CENT: Current Century
- YEAR: Current Year
- MONTH: Current Month
- DAY: Current Day in Current Week
- DATE: Current Day in Current Month
-
-
-
-
-
RTC Time Alarm Register
Name: RTC_TIMALR
Access: read-write
Address: 0x400E1A70
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
HOUREN | AMPM | HOUR | |||||
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
MINEN | MIN | ||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
SECEN | SEC |
- SEC: Second Alarm
- SECEN: Second Alarm Enable
Value Name Description 0 - The second-matching alarm is disabled. 1 - The second-matching alarm is enabled. - MIN: Minute Alarm
- MINEN: Minute Alarm Enable
Value Name Description 0 - The minute-matching alarm is disabled. 1 - The minute-matching alarm is enabled. - HOUR: Hour Alarm
- AMPM: AM/PM Indicator
- HOUREN: Hour Alarm Enable
Value Name Description 0 - The hour-matching alarm is disabled. 1 - The hour-matching alarm is enabled.
-
-
-
-
RTC Calendar Alarm Register
Name: RTC_CALALR
Access: read-write
Address: 0x400E1A74
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
DATEEN | - | DATE | |||||
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
MTHEN | - | - | MONTH | ||||
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | - | - | - | - | - |
- MONTH: Month Alarm
- MTHEN: Month Alarm Enable
Value Name Description 0 - The month-matching alarm is disabled. 1 - The month-matching alarm is enabled. - DATE: Date Alarm
- DATEEN: Date Alarm Enable
Value Name Description 0 - The date-matching alarm is disabled. 1 - The date-matching alarm is enabled.
-
-
RTC Status Register
Name: RTC_SR
Access: read-only
Address: 0x400E1A78
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | CALEV | TIMEV | SEC | ALARM | ACKUPD |
- ACKUPD: Acknowledge for Update
Value Name Description 0 - Time and calendar registers cannot be updated. 1 - Time and calendar registers can be updated. - ALARM: Alarm Flag
Value Name Description 0 - No alarm matching condition occurred. 1 - An alarm matching condition has occurred. - SEC: Second Event
Value Name Description 0 - No second event has occurred since the last clear. 1 - At least one second event has occurred since the last clear. - TIMEV: Time Event
Value Name Description 0 - No time event has occurred since the last clear. 1 - At least one time event has occurred since the last clear. - CALEV: Calendar Event
Value Name Description 0 - No calendar event has occurred since the last clear. 1 - At least one calendar event has occurred since the last clear.
RTC Status Clear Command Register
Name: RTC_SCCR
Access: write-only
Address: 0x400E1A7C
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | CALCLR | TIMCLR | SECCLR | ALRCLR | ACKCLR |
- ACKCLR: Acknowledge Clear
Value Name Description 0 - No effect. 1 - Clears corresponding status flag in the Status Register (RTC_SR). - ALRCLR: Alarm Clear
Value Name Description 0 - No effect. 1 - Clears corresponding status flag in the Status Register (RTC_SR). - SECCLR: Second Clear
Value Name Description 0 - No effect. 1 - Clears corresponding status flag in the Status Register (RTC_SR). - TIMCLR: Time Clear
Value Name Description 0 - No effect. 1 - Clears corresponding status flag in the Status Register (RTC_SR). - CALCLR: Calendar Clear
Value Name Description 0 - No effect. 1 - Clears corresponding status flag in the Status Register (RTC_SR).
RTC Interrupt Enable Register
Name: RTC_IER
Access: write-only
Address: 0x400E1A80
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | CALEN | TIMEN | SECEN | ALREN | ACKEN |
- ACKEN: Acknowledge Update Interrupt Enable
Value Name Description 0 - No effect. 1 - The acknowledge for update interrupt is enabled. - ALREN: Alarm Interrupt Enable
Value Name Description 0 - No effect. 1 - The alarm interrupt is enabled. - SECEN: Second Event Interrupt Enable
Value Name Description 0 - No effect. 1 - The second periodic interrupt is enabled. - TIMEN: Time Event Interrupt Enable
Value Name Description 0 - No effect. 1 - The selected time event interrupt is enabled. - CALEN: Calendar Event Interrupt Enable
Value Name Description 0 - No effect.
RTC Interrupt Disable Register
Name: RTC_IDR
Access: write-only
Address: 0x400E1A84
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | CALDIS | TIMDIS | SECDIS | ALRDIS | ACKDIS |
- ACKDIS: Acknowledge Update Interrupt Disable
Value Name Description 0 - No effect. 1 - The acknowledge for update interrupt is disabled. - ALRDIS: Alarm Interrupt Disable
Value Name Description 0 - No effect. 1 - The alarm interrupt is disabled. - SECDIS: Second Event Interrupt Disable
Value Name Description 0 - No effect. 1 - The second periodic interrupt is disabled. - TIMDIS: Time Event Interrupt Disable
Value Name Description 0 - No effect. 1 - The selected time event interrupt is disabled. - CALDIS: Calendar Event Interrupt Disable
Value Name Description 0 - No effect. 1 - The selected calendar event interrupt is disabled.
RTC Interrupt Mask Register
Name: RTC_IMR
Access: read-only
Address: 0x400E1A88
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | CAL | TIM | SEC | ALR | ACK |
- ACK: Acknowledge Update Interrupt Mask
Value Name Description 0 - The acknowledge for update interrupt is disabled. 1 - The acknowledge for update interrupt is enabled. - ALR: Alarm Interrupt Mask
Value Name Description 0 - The alarm interrupt is disabled. 1 - The alarm interrupt is enabled. - SEC: Second Event Interrupt Mask
Value Name Description 0 - The second periodic interrupt is disabled. 1 - The second periodic interrupt is enabled. - TIM: Time Event Interrupt Mask
Value Name Description 0 - The selected time event interrupt is disabled. 1 - The selected time event interrupt is enabled. - CAL: Calendar Event Interrupt Mask
Value Name Description 0 - The selected calendar event interrupt is disabled. 1 - The selected calendar event interrupt is enabled.
RTC Valid Entry Register
Name: RTC_VER
Access: read-only
Address: 0x400E1A8C
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
- | - | - | - | - | - | - | - |
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
- | - | - | - | - | - | - | - |
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
- | - | - | - | - | - | - | - |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | - | NVCALALR | NVTIMALR | NVCAL | NVTIM |
- NVTIM: Non-valid Time
Value Name Description 0 - No invalid data has been detected in RTC_TIMR (Time Register). 1 - RTC_TIMR has contained invalid data since it was last programmed. - NVCAL: Non-valid Calendar
Value Name Description 0 - No invalid data has been detected in RTC_CALR (Calendar Register). 1 - RTC_CALR has contained invalid data since it was last programmed. - NVTIMALR: Non-valid Time Alarm
Value Name Description 0 - No invalid data has been detected in RTC_TIMALR (Time Alarm Register). 1 - RTC_TIMALR has contained invalid data since it was last programmed. - NVCALALR: Non-valid Calendar Alarm
Value Name Description 0 - No invalid data has been detected in RTC_CALALR (Calendar Alarm Register). 1 - RTC_CALALR has contained invalid data since it was last programmed.
RTC Write Protect Mode Register
Name: RTC_WPMR
Access: read-write
Address: 0x400E1B44
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 |
WPKEY | |||||||
23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
WPKEY | |||||||
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
WPKEY | |||||||
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
- | - | - | - | - | - | - | WPEN |
- WPEN: Write Protect Enable
Value Name Description 0 - Disables the Write Protect if WPKEY corresponds to 0x525443 ("RTC" in ASCII). 1 - Enables the Write Protect if WPKEY corresponds to 0x525443 ("RTC" in ASCII). - WPKEY
-