SH7708 datasheet(345/633 Pages) RENESAS

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12.2.9

Second Alarm Register (RSECAR)

The second alarm register (RSECAR) is an 8-bit read/write register, and an alarm register

corresponding to the BCD-coded second section counter RSECCNT of the RTC. When the

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

RSECAR, RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR registers, the counter and alarm

coincide, an RTC alarm interrupt is generated.

The range that can be set is 00–59 (decimal) + ENB bit. 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:

ENB

10 seconds

1 second

Initial value:

—

R/W:

R/W

12.2.10

Minute Alarm Register (RMINAR)

The minute alarm register (RMINAR) is an 8-bit read/write register, and an alarm register

corresponding to the BCD-coded minute section counter RMINCNT of the RTC. When the ENB

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

RMINAR, RHRAR, RWKAR, RDAYAR, RMONAR registers, the counter and alarm register

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

RTC alarm interrupt is generated.

The range that can be set is 00–59 (decimal) + ENB bit. 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. Contents are retained in a

manual reset and in standby mode.

Bit:

Bit name:

ENB

10 minutes

1 minute

Initial value:

—

R/W:

R/W

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