SH7713 datasheet(555/904 Pages) RENESAS

555 / 904 page

Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 515 of 860

REJ09B0288-0150

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

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

reset, or in standby mode.

Bit

Bit Name

Initial Value

R/W

Description

ENB

R/W

Minute Alarm Enable

Specifies whether comparison of RMINCNT and

RMINAR is performed as an alarm condition.

0: Not compared

1: Compared

6 to 4



R/W

Setting value for 10-unit of minute alarm in the

BCD-code.

The range can be set from 0 to 5 (decimal).

3 to 0



R/W

Setting value for 1-unit of minute alarm in the

BCD-code.

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

15.3.11

Hour Alarm Register (RHRAR)

RHRAR is an alarm register corresponding to the hour counter RHRCNT of the RTC. When the

ENB bit is set to 1, a comparison with the RHRCNT 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 hour alarm which can be set is 0 to 23 (decimal). Errant operation will result if any

other value is set.

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

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

in standby mode.

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