SH7721 datasheet(552/1524 Pages) RENESAS

Part #	SH7721

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

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 13

Power-Down Modes

Rev. 3.00

Jan. 18, 2008

Page 490 of 1458

REJ09B0033-0300

Immediately after an interrupt is detected, the phase of the clock output of the CKIO pin may be

unstable, until software standby mode is canceled.

Notes: 1. Only when the RTC is used, software standby mode can be canceled by IRQ (edge

detection), RTC, TMU, or PINT interrupt.

2. Cancel this software standby mode by a power-on reset.

WTCNT value

H'FF

H'80

Time

Interrupt

request

WDT overflow and branch to

interrupt handling routine

Crystal oscillator settling

time and PLL synchronization

time

Clear the STBY bit in STBCR before

WTCNT reaches H'80. When

he STBY bit in STBCR is cleared,

WTCNT halts automatically.

Figure 13.1

Canceling Standby Mode with STBY Bit in STBCR

(2)

Canceling with Reset

Software standby mode is canceled by a reset with the

RESETP pin and RESETM pin. Keep the

RESETP pin and RESETM pin low until the clock oscillation settles in clock operating mode to

use PLL. The internal clock will continue to be output to the CKIO pin.

SH7721 Datasheet(PDF) 552 Page - Renesas Technology Corp