SH7708 datasheet(350/633 Pages) RENESAS

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12.2.16

RTC Control Register 2 (RCR2)

The RTC control register 2 (RCR2) is an 8-bit read/write 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 not initialized by a manual reset or in standby mode, and retains

its contents.

Bit:

Bit name:

PEF

PES2

PES1

PES0

RTCEN

ADJ

RESET

START

Initial value:

R/W:

R/W

Bit 7—Periodic Interrupt Flag (PEF): Indicates interrupt generation with the period designated by

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

Bit 7: PEF

Description

Interrupts not generated with the period designated by the PES bits.

Clearing condition: When 0 is written to PEF

(Initial value)

Interrupts generated with the period designated by the PES bits.

Setting condition: When 1 is written to PEF

Bits 6–4—Periodic Interrupt Flags (PES2–PES0): These bits specify the periodic interrupt.

Bit 6: PES2

Bit 5: PES1

Bit 4: PES0

Description

No periodic interrupts generated (Initial value)

Periodic interrupt generated every 1/256 second

Periodic interrupt generated every 1/64 second

Periodic interrupt generated every 1/16 second

Periodic interrupt generated every 1/4 second

Periodic interrupt generated every 1/2 second

Periodic interrupt generated every 1 second

Periodic interrupt generated every 2 seconds

Bit 3—RTCEN: Controls the operation of the crystal oscillator for the RTC.

Bit 3: RTCEN

Description

Halts the crystal oscillator for the RTC.

Runs the crystal oscillator for the RTC.

(Initial value)

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