Renesas Stereo System SH7709S Manual De Usuario

Rev. 5.00, 09/03, page 420 of 760

Alarm Interrupt Enable Flag (AIE): 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

(Initial value)

1

An alarm interrupt is generated when the AF flag is set to 1

Alarm Flag (AF): The AF flag is set to 1 when the alarm time set in an alarm register

(only registers with ENB bit set to 1) matches the clock and calendar time.  This flag is cleared to
0 when 0 is written, but holds its previous value when 1 is written.

0

Clock/calendar and alarm register have not matched since last reset to 0
Clearing condition: When 0 is written to AF

(Initial value)

1

Setting condition: Clock/calendar and alarm register have matched (only
registers with ENB set)

*

Note:  

*

  Contents do not change when 1 is written to AF.

The RTC control register 2 (RCR2) is an 8-bit readable/writable register for periodic interrupt
control, 30-second adjustment ADJ, divider circuit RESET, and RTC count start/stop control. It is
initialized to H'09 by a power-on reset. It is initialized except for RTCEN and START by a
manual reset. It is not initialized, and retains its contents, in standby mode.

Bit:

7

6

5

4

3

2

1

0

PEF

PES2

PES1

PES0

RTCEN

ADJ

RESET

START

Initial  value:

0

0

0

0

1

0

0

1

R/W:

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

Periodic Interrupt Flag (PEF): Indicates interrupt generation with the period designated

by the PES bits. When set to 1, PEF generates periodic interrupts.

0

Interrupts not generated with the period designated by the PES bits
Clearing condition: When 0 is written to PEF

(Initial value)

1

Interrupts generated with the period designated by the PES bits
Setting condition: When 1 is written to PEF