HD64F36049 datasheet(189/562 Pages) RENESAS

Part #	HD64F36049

Description	Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Tiny Series

PDF	562 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 10 Realtime Clock (RTC)

Rev. 3.00 Mar. 15, 2006 Page 157 of 526

REJ09B0060-0300

10.4

Operation

10.4.1

Initial Settings of Registers after Power-On

The RTC registers that store second, minute, hour, and day-of week data are not reset by a

RES

input. Therefore, all registers must be set to their initial values after power-on. Once the register

setting are made, the RTC provides an accurate time as long as power is supplied regardless of a

RES input.

10.4.2

Initial Setting Procedure

Figure 10.3 shows the procedure for the initial setting of the RTC. To set the RTC again, also

follow this procedure.

RTC operation is stopped.

RTC registers and clock count

controller are reset.

Clock output and clock source are

selected and second, minute, hour,

day-of-week,operating mode, and

a.m/p.m are set.

RTC operation is started.

RUN in RTCCR1=0

RST in RTCCR1=1

RST in RTCCR1=0

Set RTCCSR, RSECDR,

RMINDR,RHRDR,

RWKDR,12/24 in

RTCCR1, and PM

RUN in RTCCR1=1

Figure 10.3 Initial Setting Procedure

HD64F36049 Datasheet(PDF) 189 Page - Renesas Technology Corp