AT91SAM7L128 RTC

Real-time Clock (RTC) User Interface

Registers

Register Mapping

Address	Register	Name	Access	Reset
0xFFFFFD60	Control Register	RTC_CR	read-write	0x0
0xFFFFFD64	Mode Register	RTC_MR	read-write	0x0
0xFFFFFD68	Time Register	RTC_TIMR	read-write	0x0
0xFFFFFD6C	Calendar Register	RTC_CALR	read-write	0x01819819
0xFFFFFD70	Time Alarm Register	RTC_TIMALR	read-write	0x0
0xFFFFFD74	Calendar Alarm Register	RTC_CALALR	read-write	0x01010000
0xFFFFFD78	Status Register	RTC_SR	read-only	0x0
0xFFFFFD7C	Status Clear Command Register	RTC_SCCR	write-only	-
0xFFFFFD80	Interrupt Enable Register	RTC_IER	write-only	-
0xFFFFFD84	Interrupt Disable Register	RTC_IDR	write-only	-
0xFFFFFD88	Interrupt Mask Register	RTC_IMR	read-only	0x0
0xFFFFFD8C	Valid Entry Register	RTC_VER	read-only	0x0

Register Fields

RTC Control Register

Name: RTC_CR

Access: read-write

Address: 0xFFFFFD60

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
• 0 = No effect.
• 1 = Stops the RTC time counting.
• UPDCAL: Update Request Calendar Register
• 0 = No effect.
• 1 = Stops the RTC calendar counting.
• TIMEVSEL: Time Event Selection
• 0x0 = Minute change.
• 0x1 = Hour change.
• 0x2 = Every day at midnight.
• 0x3 = Every day at noon.
• CALEVSEL: Calendar Event Selection
• 0 = Week change (every Monday at time 00:00:00).
• 1 = Month change (every 01 of each month at time 00:00:00).

RTC Mode Register

Name: RTC_MR

Access: read-write

Address: 0xFFFFFD64

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
• 0 = 24-hour mode is selected.
• 1 = 12-hour mode is selected.

RTC Time Register

Name: RTC_TIMR

Access: read-write

Address: 0xFFFFFD68

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
• 0 = AM.
• 1 = PM.

RTC Calendar Register

Name: RTC_CALR

Access: read-write

Address: 0xFFFFFD6C

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: 0xFFFFFD70

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
• 0 = The second-matching alarm is disabled.
• 1 = The second-matching alarm is enabled.
• MIN: Minute Alarm

-

• MINEN: Minute Alarm Enable
• 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
• 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: 0xFFFFFD74

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
• 0 = The month-matching alarm is disabled.
• 1 = The month-matching alarm is enabled.
• DATE: Date Alarm

-

• DATEEN: Date Alarm Enable
• 0 = The date-matching alarm is disabled.
• 1 = The date-matching alarm is enabled.

RTC Status Register

Name: RTC_SR

Access: read-only

Address: 0xFFFFFD78

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
• 0 = Time and calendar registers cannot be updated.
• 1 = Time and calendar registers can be updated.
• ALARM: Alarm Flag
• 0 = No alarm matching condition occurred.
• 1 = An alarm matching condition has occurred.
• SEC: Second Event
• 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
• 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
• 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: 0xFFFFFD7C

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
• 0 = No effect.
• 1 = Clears corresponding status flag in the Status Register (RTC_SR).
• ALRCLR: Alarm Clear
• 0 = No effect.
• 1 = Clears corresponding status flag in the Status Register (RTC_SR).
• SECCLR: Second Clear
• 0 = No effect.
• 1 = Clears corresponding status flag in the Status Register (RTC_SR).
• TIMCLR: Time Clear
• 0 = No effect.
• 1 = Clears corresponding status flag in the Status Register (RTC_SR).
• CALCLR: Calendar Clear
• 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: 0xFFFFFD80

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
• 0 = No effect.
• 1 = The acknowledge for update interrupt is enabled.
• ALREN: Alarm Interrupt Enable
• 0 = No effect.
• 1 = The alarm interrupt is enabled.
• SECEN: Second Event Interrupt Enable
• 0 = No effect.
• 1 = The second periodic interrupt is enabled.
• TIMEN: Time Event Interrupt Enable
• 0 = No effect.
• 1 = The selected time event interrupt is enabled.
• CALEN: Calendar Event Interrupt Enable
• 0 = No effect.

RTC Interrupt Disable Register

Name: RTC_IDR

Access: write-only

Address: 0xFFFFFD84

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
• 0 = No effect.
• 1 = The acknowledge for update interrupt is disabled.
• ALRDIS: Alarm Interrupt Disable
• 0 = No effect.
• 1 = The alarm interrupt is disabled.
• SECDIS: Second Event Interrupt Disable
• 0 = No effect.
• 1 = The second periodic interrupt is disabled.
• TIMDIS: Time Event Interrupt Disable
• 0 = No effect.
• 1 = The selected time event interrupt is disabled.
• CALDIS: Calendar Event Interrupt Disable
• 0 = No effect.
• 1 = The selected calendar event interrupt is disabled.

RTC Interrupt Mask Register

Name: RTC_IMR

Access: read-only

Address: 0xFFFFFD88

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
• 0 = The acknowledge for update interrupt is disabled.
• 1 = The acknowledge for update interrupt is enabled.
• ALR: Alarm Interrupt Mask
• 0 = The alarm interrupt is disabled.
• 1 = The alarm interrupt is enabled.
• SEC: Second Event Interrupt Mask
• 0 = The second periodic interrupt is disabled.
• 1 = The second periodic interrupt is enabled.
• TIM: Time Event Interrupt Mask
• 0 = The selected time event interrupt is disabled.
• 1 = The selected time event interrupt is enabled.
• CAL: Calendar Event Interrupt Mask
• 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: 0xFFFFFD8C

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
• 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
• 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
• 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
• 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.