SH7713 datasheet(560/904 Pages) RENESAS

560 / 904 page

Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 520 of 860

REJ09B0288-0150

Bit

Bit Name

Initial Value

R/W

Description

15 to 12



R/W

Setting value for 1000-unit of year alarm in the

BCD-code.

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

11 to 8



R/W

Setting value for 100-unit of year alarm in the

BCD-code.

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

7 to 4



R/W

Setting value for 10-unit of year alarm in the

BCD-code.

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

3 to 0



R/W

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

code.

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

15.3.16

RTC Control Register 1 (RCR1)

RCR1 is a register that affects carry flags and alarm flags. It also selects whether to generate

interrupts for each flag. Because flags are sometimes set after an operand read, do not use this

RCR1 is an 8-bit readable/writable register. RCR1 is initialized to H'00 by a power-on reset or a

manual reset, all bits are initialized to 0 except for the CF flag, which is undefined. When using

the CF flag, it must be initialized beforehand. This register is not initialized in standby mode.

Bit

Bit Name

Initial Value

R/W

Description

Undefined

R/W

Carry Flag

Status flag that indicates that a carry has

occurred. CF is set to 1 when a count-up to

R64CNT or RSECCNT occurs. A count register

value read at this time cannot be guaranteed;

another read is required.

0: No count up of R64CNT or RSECCNT.

Clearing condition: When 0 is written to CF

1: Count up of R64CNT or RSECCNT.

Setting condition: When 1 is written to CF or if

the carry of R64CNT or RSECCNT occurs

when R64CNT or RSECCNT is read.

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