HD64F36049 datasheet(185/562 Pages) RENESAS

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Section 10 Realtime Clock (RTC)

Rev. 3.00 Mar. 15, 2006 Page 153 of 526

REJ09B0060-0300

10.3.5

RTC Control Register 1 (RTCCR1)

RTCCR1 controls start/stop and reset of the clock timer. For the definition of time expression, see

figure 10.2.

Bit

Bit Name

Initial

Value

R/W

Description

RUN

—

R/W

RTC Operation Start

0: Stops RTC operation

1: Starts RTC operation

12/24

—

R/W

Operating Mode

0: RTC operates in 12-hour mode. RHRDR counts on 0

to 11.

1: RTC operates in 24-hour mode. RHRDR counts on 0

to 23.

—

R/W

a.m./p.m.

0: Indicates a.m. when RTC is in the 12-hour mode.

1: Indicates p.m. when RTC is in the 12-hour mode.

RST

R/W

Reset

0: Normal operation

1: Resets registers and control circuits except RTCCSR

and this bit. Clear this bit to 0 after having been set to

INT

—

R/W

Interrupt Generation Timing

0: Generates a second, minute, hour, or day-of-week

periodic interrupt during RTC busy period.

1: Generates a second, minute, hour, or day-of-week

periodic interrupt immediately after completing RTC

busy period.

—

Reserved

These bits are always read as 0.

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