SH7261 datasheet(677/1348 Pages) RENESAS

677 / 1348 page

Section 15 Realtime Clock (RTC)

Rev. 2.00 Sep. 07, 2007 Page 645 of 1312

REJ09B0320-0200

15.3.4

Hour Counter (RHRCNT)

RHRCNT is used for setting/counting in the BCD-coded hour section. The count operation is

performed by a carry for each 1 hour of the minute counter.

The assignable range is from 00 through 23 (practically in BCD), otherwise operation errors occur.

Carry out write processing after stopping the count operation through the setting of the START bit

in RCR2.

RHRCNT is not initialized by a power-on reset or manual reset, or in deep standby and software

standby modes.

R/W

Bit:

Initial value:

R/W:

——

——————

10 hours

1 hour

Bit

Bit Name

Initial

Value

R/W

Description

7, 6



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

5, 4

10 hours

Undefined

R/W

Counting Ten's Position of Hours

Counts on 0 to 2 for ten's position of hours.

3 to 0

1 hour

Undefined

R/W

Counting One's Position of Hours

Counts on 0 to 9 once per hour. When a carry is

generated, 1 is added to the ten's position.

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