SH7261 datasheet(689/1348 Pages) RENESAS

689 / 1348 page

Section 15 Realtime Clock (RTC)

Rev. 2.00 Sep. 07, 2007 Page 657 of 1312

REJ09B0320-0200

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.

RCR1 is initialized to H'00 by a power-on reset, a manual reset, or in deep standby mode. The CF

flag is retained undefined until the division circuit is reset (the RESET and ADJ bits in RCR2 are

set to 1). When using the CF flag, make sure to reset the divider circuit beforehand. This register is

not initialized in software standby mode.

R/W

Bit:

Initial value:

R/W:

—

CIE

AIE

—

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 64-Hz occurs at the

second counter carry or 64-Hz counter read. A count

another read is required.

0: No carry of 64-Hz counter by second counter or 64-

Hz counter

[Clearing condition]

• When 0 is written to CF

1: Carry of 64-Hz counter by second counter or 64 Hz

counter

[Setting condition]

• When the second counter or 64-Hz counter is read

during a carry occurrence by the 64-Hz counter, or 1

is written to CF.

6, 5

—

All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

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