SH7672 datasheet(418/1292 Pages) RENESAS

Part #	SH7672

Description	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

PDF	1292 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 11 Power-Down Modes

Rev. 1.00 Nov. 14, 2007 Page 392 of 1262

REJ09B0437-0100

11.3.3

Software Standby Mode Application Example

This example describes a transition to software standby mode on the falling edge of the NMI

signal, and cancellation on the rising edge of the NMI signal. The timing is shown in figure 11.1.

When the NMI pin is changed from high to low level while the NMI edge select bit (NMIE) in

ICR is set to 0 (falling edge detection), the NMI interrupt is accepted. When the NMIE bit is set to

1 (rising edge detection) by the NMI exception service routine, the STBY bit in STBCR is set to 1,

and a SLEEP instruction is executed, software standby mode is entered. Thereafter, software

standby mode is canceled when the NMI pin is changed from low to high level.

NMI pin

NMIE bit

STBY bit

LSI state

Oscillator

Program

execution

NMI

exception

handling

NMI exception

handling

Exception

service routine

Software

standby mode

Oscillation

settling time

Figure 11.1 NMI Timing in Software Standby Mode (Application Example)

SH7672 Datasheet(PDF) 418 Page - Renesas Technology Corp