H8SSLASH2218 datasheet(402/750 Pages) RENESAS

402 / 750 page

Section 11 Realtime Clock (RTC)

Rev.6.00 Jun. 03, 2008 Page 354 of 698

REJ09B0074-0600

11.3.5

RTC Control Register 1 (RTCCR1)

RTCCR1 controls start/stop and reset of the clock timer. Bits 7 to 5 of this register are initialized

to H'00 by a

STBY input or the RST bit in RTCCR1, but not initialized by a RES input. For the

definition of time expression, see figure 11.2.

Bit

Bit Name

Initial Value* R/W

Description

RUN

—

R/W

RTC Operation Start

0: Stops RTC and free running counter operation

1: Starts RTC and free running counter 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 1.

3 to

—

All 0

—

Reserved

These bits are always read as 0.

Note: * Initial value after

RES.

24-hour count

0123456789 10 11 12 13 14 15 16 17

12-hour count

24-hour count

12-hour count

0 (Morning)

1 (Afternoon)

Noon

123456789 10 11

012345

18 19 20 21 22 23 0

1 (Afternoon)

789 10 11

Figure 11.2 Definition of Time Expression

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