SH7713 datasheet(561/904 Pages) RENESAS

561 / 904 page

Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 521 of 860

REJ09B0288-0150

Bit

Bit Name

Initial Value

R/W

Description

—

Reserved

These bits are always read as 0. The write value

should always be 0.

CIE

R/W

Carry Interrupt Enable Flag

When the carry flag (CF) is set to 1, the CIE bit

enables interrupts.

0: A carry interrupt is not generated when the CF

flag is set to 1

1: A carry interrupt is generated when the CF flag

is set to 1

AIE

R/W

Alarm Interrupt Enable Flag

When the alarm flag (AF) is set to 1, the AIE bit

allows interrupts.

0: An alarm interrupt is not generated when the

AF flag is set to 1

1: An alarm interrupt is generated when the AF

flag is set to 1

—

Reserved

These bits are always read as 0. The write value

should always be 0.

R/W

Alarm Flag

The AF flag is set to 1 when the alarm time set in

an alarm register (only registers with the ENB bit

of the corresponding alarm registers and YAEN

bit in RCR3 set to 1) matches the clock and

calendar time. This flag is cleared to 0 when 0 is

written, but holds the previous value when 1 is to

be written.

0: Clock/calendar and alarm register have not

matched.

Clearing condition: When 0 is written to AF

1: Clock/calendar and alarm register have

matched.

Setting condition: Clock/calendar and alarm

ENB bit and YAEN bit in RCR3 set to 1)

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