SH7713 datasheet(565/904 Pages) RENESAS

Part #	SH7713

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	904 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 15 Realtime Clock (RTC)

Rev.1.50 Aug. 30, 2006 Page 525 of 860

REJ09B0288-0150

15.4

Operation

15.4.1

Initial Settings of Registers after Power-On

All the registers should be set after the power is turned on.

15.4.2

Setting Time

Figure 15.2 shows how to set the time when the clock is stopped.

Write 1 to RESET and 0 to

START in the RCR2 register

Order is irrelevant

Write 1 to START in the

RCR2 register

Set seconds, minutes,

hour, day, day of the

week, month, and year

Stop clock,

reset divider circuit

Start clock

Figure 15.2 Setting Time

15.4.3

Reading Time

Figure 15.3 shows how to read the time.

If a carry occurs while reading the time, the correct time will not be obtained, so it must be read

again. Part (a) in figure 15.3 shows the method of reading the time without using interrupts; part

(b) in figure 15.3 shows the method using carry interrupts. To keep programming simple, method

(a) should normally be used.

SH7713 Datasheet(PDF) 565 Page - Renesas Technology Corp