SH7721 datasheet(629/1524 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]

Direct Link	http://www.renesas.com

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Section 17 Realtime Clock (RTC)

Rev. 3.00 Jan. 18, 2008 Page 567 of 1458

REJ09B0033-0300

17.3.5

Day of Week Counter (RWKCNT)

RWKCNT is used for setting/counting day of week section. The count operation is performed by a

carry for each day of the date counter.

The range for day of the week can be set is 0 to 6 (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.

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

Bit

Bit Name

Initial Value

R/W

Description

7 to 3



All 0

Reserved

These bits are always read as 0. Though writing

has n effect, the write value should always be 0.

2 to 0



Undefined

R/W

Day-of-Week Counting

Day-of-week is indicated with a binary code.

000: Sunday

001: Monday

010: Tuesday

011: Wednesday

100: Thursday

101: Friday

110: Saturday

111: Reserved (setting prohibited)

SH7721 Datasheet(PDF) 629 Page - Renesas Technology Corp