SH7721 datasheet(640/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 17 Realtime Clock (RTC)

Rev. 3.00 Jan. 18, 2008 Page 578 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial Value

R/W

Description

RTCEN

R/W

Crystal Oscillator Control

Controls the operation of the crystal oscillator for

the RTC.

0: Halts the crystal oscillator for the RTC.

1: Runs the crystal oscillator for the RTC.

ADJ

R/W

30-Second Adjustment

When 1 is written to the ADJ bit, times of 29

seconds or less will be rounded to 00 seconds

and 30 seconds or more to 1 minute. The divider

circuit (RTC prescaler and R64CNT) will be

simultaneously reset. This bit always reads 0.

0: Runs normally.

1: 30-second adjustment.

RESET

R/W

Reset

When 1 is written, initializes the divider circuit

(RTC prescaler and R64CNT). This bit always

0: Runs normally.

1: Divider circuit is reset.

START

R/W

Start Bit

Halts and restarts the counter (clock).

0: Second/minute/hour/day/week/month/year

counter halts.

1: Second/minute/hour/day/week/month/year

counter runs normally.

Note: The 64-Hz counter always runs unless

stopped with the RTCEN bit.

SH7721 Datasheet(PDF) 640 Page - Renesas Technology Corp

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