SH7721 datasheet(632/1524 Pages) RENESAS

632 / 1524 page

Section 17 Realtime Clock (RTC)

Rev. 3.00 Jan. 18, 2008 Page 570 of 1458

REJ09B0033-0300

17.3.9

Second Alarm Register (RSECAR)

RSECAR is an alarm register corresponding to the BCD coded second counter RSECCNT of the

RTC. When the ENB bit is set to 1, a comparison with the RSECCNT value is performed. From

among RSECAR/RMINAR/RHRAR/RWKAR/RDAYAR/RMONAR/RCR3, the counter and

alarm register comparison is performed only on those with ENB bits set to 1, and if each of those

coincide, an alarm flag of RCR1 is set to 1.

The range of second alarm which can be set is 00 to 59 (decimal)

+ ENB bits. Errant operation

will result if any other value is set.

The ENB bit in RSECAR is initialized to 0 by a power-on reset. The remaining RSECAR 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

When this bit is set to 1, a comparison with the

RSECCNT value is performed.

6 to 4



Undefined

R/W

Ten’s position of seconds setting value

3 to 0



Undefined

R/W

One’s position of seconds setting value

17.3.10

Minute Alarm Register (RMINAR)

RMINAR is an alarm register corresponding to the minute counter RMINCNT. When the ENB bit

is set to 1, a comparison with the RMINCNT value is performed. From among

RSECAR/RMINAR/RHRAR/RWKAR/RDAYAR/RMONAR/RCR3, the counter and alarm

coincide, an alarm flag of RCR1 is set to 1.

The range of minute alarm which can be set is 00 to 59 (decimal). Errant operation will result if

any other value is set.

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

When this bit is set to 1, a comparison with the

RMINCNT value is performed.

6 to 4



Undefined

R/W

Ten’s position of minutes setting value

3 to 0



Undefined

R/W

One’s position of minutes setting value

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