SH7261 datasheet(692/1348 Pages) RENESAS

692 / 1348 page

Section 15 Realtime Clock (RTC)

Rev. 2.00 Sep. 07, 2007 Page 660 of 1312

REJ09B0320-0200

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.

Important: When using this bit, see section 15.5.5,

Procedure for Setting the 30-Second Adjustment

Function.

0: Runs normally.

1: 30-second adjustment.

RESET

R/W

Reset

Writing 1 to this bit initializes the divider circuit. In this

case, the RESET bit is automatically reset to 0 after 1 is

written to and the divider circuit (RTC prescaler and

R64CNT) is reset. Thus, there is no need to write 1 to

this bit. This bit is always read as 0.

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.

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