SH7052 datasheet(827/919 Pages) RENESAS

tên linh kiện	SH7052

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23.4.3

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 23.3.

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 software standby bit (SSBY) in

SBYCR 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.

Oscillator

NMI pin

NMIE bit

SSBY bit

SH7055

state

Oscillation

start time

Program

execution

Exception

service routine

Software

standby mode

WDT

set time

NMI exception

processing

NMI

exception

processing

Oscillation settling time

Figure 23.3 Software Standby Mode NMI Timing (Application Example)

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