Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 48)

11050A–PMAAC–07-Apr-10

AT73C246

11.10.8 RTC Status Register

Name: RTC_SR

Access: Read-only

Address: 0x18

• 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.

The time event is selected in the TIMEVSEL field in RTC_CTRL (Control Register) and can be any one of the following

events: minute change, hour change, noon, midnight (day change).

• 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.

The calendar event is selected in the CALEVSEL field in RTC_CR and can be any one of the following events: week

change, month change and year change.

31 30 29 28 27 26 25 24

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15 14 13 12 11 10 9 8

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76543210

– – – CALEV TIMEV SEC ALARM ACKUPD

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Rainbow-electronics AT73C246 Manual do Utilizador Página 48