SH7713 datasheet(556/904 Pages) RENESAS

556 / 904 page

Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 516 of 860

REJ09B0288-0150

Bit

Bit Name

Initial Value

R/W

Description

ENB

R/W

Hour Alarm Enable

Specifies whether comparison of RHRCNT and

RHRAR is performed as an alarm condition.

0: Not compared

1: Compared



Reserved

This bit is always read as 0. The write value

should always be 0.

5, 4



R/W

Setting value for 10-unit of hour alarm in the

BCD-code.

The range can be set from 0 to 2 (decimal).

3 to 0



R/W

Setting value for 1-unit of hour alarm in the BCD-

code.

The range can be set from 0 to 9 (decimal).

15.3.12

Day of Week Alarm Register (RWKAR)

RWKAR is an alarm register corresponding to the day of week counter RWKCNT. When the

ENB bit is set to 1, a comparison with the RWKCNT value is performed. From among

RSECAR/RMINAR/RHRAR/RWKAR/RDAYAR/RMONAR, the counter and alarm register

comparison is performed only on those with ENB bits and the YAEN bit in RCR3 set to 1, and if

each of those coincide, an RTC alarm interrupt is generated.

The range of day of the week alarm which can be set is 0 to 6 (decimal). Errant operation will

result if any other value is set.

RWKAR is an 8-bit readable/writable register. The ENB bit in RWKAR is initialized by a power-

on reset. The remaining RWKAR fields are not initialized by a power-on reset or manual reset, or

in standby mode.

SH7713 Datasheet(PDF) 556 Page - Renesas Technology Corp

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