STR720 datasheet(153/401 Pages) STMICROELECTRONICS

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STR720 - REAL TIME CLOCK (RTC)

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RTCCR: RTC Control Register

Address Offset: 00h

Reset value: 0020h

The functions of the RTC are controlled by this control register. It is not possible to write this

(see “Configuration mode” on page 152).

Bit 15:11 = Reserved. These bits must always be written to ‘0’.

Bit 10 = PEREN: PERiodic interrupt ENable

0: Periodic interrupt is masked.

1: Periodic interrupt is enabled.

Bit 9 = AEN: Alarm interrupt ENable

0: Alarm interrupt is masked.

1: Alarm interrupt is enabled.

Bit 8 = Reserved. This bits must always be written to ‘0’.

The above listed bits are used to mask interrupt requests. Note that at reset all interrupts are

disabled, so it is possible to write the RTC registers so that no interrupt requests are pending

after initialization.

Bits 7:6 = Reserved. These bits must always be written to ‘0’.

Bit 5 = RTOFF: RTc operation OFF

With this bit RTC reports the status of the last write operation performed on its registers,

indicating if it has been completed or not. If its value is ‘0’ then it is not possible to write any

RTC register. This bit can only be read by software.

0: Last write operation on RTC registers is still active.

1: Last write operation on RTC registers terminated.

Note

A read operation on RTC registers with RTOFF=0 returns anyway their current value.

Bit 4 = CNF: CoNfiguration Flag

This bit must be set at ‘1’ by software in order to enter the configuration mode thus allowing to

write new values in RTCCNT, RTCA, RTCP registers. The writing operation is really executed

when the CNF bit after being set, is reset again by software.

0: Exit configuration mode (start update of RTC registers).

1: Enter configuration mode.

Bit 3 = Reserved. This bits must always be written to ‘0’, but it will be read back as ‘1’.

765432

Reserved

PEREN

AEN

Res.

Reserved

RTOFF

CNF

Res.

PERIR

AIR

Res.

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