SH7721 datasheet(628/1524 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 566 of 1458

REJ09B0033-0300

17.3.4

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 range of hour can be set is 00 to 23 (decimal). Errant operation will result if any other value is

set. Carry out write processing after stopping the count operation with the START bit in RCR2.

RHRCNT is not initialized by a power-on reset or manual reset, or in standby mode.

Bit

Bit Name

Initial Value

R/W

Description

7, 6



All 0

Reserved

These bits are always read as 0. Though writing

has no effect, the write value should always be 0.

5, 4



Undefined

R/W

Counting Ten’s Position of Hours

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

3 to 0



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.

SH7721 Datasheet(PDF) 628 Page - Renesas Technology Corp