SH7721 datasheet(638/1524 Pages) RENESAS

638 / 1524 page

Section 17 Realtime Clock (RTC)

Rev. 3.00 Jan. 18, 2008 Page 576 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial Value

R/W

Description

CIE

R/W

Carry Interrupt Enable Flag

When the carry flag (CF) is set to 1, the CIE bit

enables interrupts.

0: A carry interrupt is not generated when the CF

flag is set to 1

1: A carry interrupt is generated when the CF flag

is set to 1

AIE

R/W

Alarm Interrupt Enable Flag

When the alarm flag (AF) is set to 1, the AIE bit

allows interrupts.

0: An alarm interrupt is not generated when the

AF flag is set to 1

1: An alarm interrupt is generated when the AF

flag is set to 1

2, 1

—

All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

R/W

Alarm Flag

The AF flag is set when the alarm time, which is

set by an alarm register(ENB bit in RSECAR,

RMINAR, RHRAR, RWKAR, RDAYAR,

RMONAR, or RYRAR is set to 1), and counter

match.

0: Alarm register and counter not match

[Clearing condition]

When 0 is written to AF.

1: Alarm register and counter match*

[Setting condition]

When alarm register (only a register with ENB bit

set to 1) and counter match

Note:

Writing 1 holds previous value.

SH7721 Datasheet(PDF) 638 Page - Renesas Technology Corp

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