SH7713 datasheet(562/904 Pages) RENESAS

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Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 522 of 860

REJ09B0288-0150

15.3.17

RTC Control Register 2 (RCR2)

RCR2 is a register for periodic interrupt control, 30-second adjustment ADJ, divider circuit

RESET, and RTC count start/stop control.

RCR2 is an 8-bit readable/writable register. 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 in standby mode,

and retains its contents.

Bit

Bit Name

Initial Value

R/W

Description

PEF

R/W

Periodic Interrupt Flag

Indicates interrupt generation with the period

designated by the PES2 to PES0 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

1: Interrupts generated with the period

designated by the PES bits.

Setting condition: When an interrupt is

generated with the period designated by the

PES0 to PES2 bits or when 1 is written to the

PEF flag

PES2

PES1

PES0

R/W

Periodic Interrupt Flags

These bits specify the periodic interrupt.

000: No periodic interrupts generated

001: Periodic interrupt generated every 1/256

second

010: Periodic interrupt generated every 1/64

second

011: Periodic interrupt generated every 1/16

second

100: Periodic interrupt generated every 1/4

second

101: Periodic interrupt generated every 1/2

second

110: Periodic interrupt generated every 1 second

111: Periodic interrupt generated every 2

seconds

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