Software Standby Mode Application Example; Figure 20.3 Software Standby Mode Application Example - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Table of Contents

Section 20 Power-Down Modes

Software Standby Mode Application Example

Figure 20.3 shows an example in which a transition is made to software standby mode at a falling

edge on the NMI pin, and software standby mode is cleared at a rising edge on the NMI pin.

In this example, an NMI interrupt is accepted with the NMIEG bit in SYSCR cleared to 0 (falling

edge specification), then the NMIEG bit is set to 1 (rising edge specification), the SSBY bit is set

to 1, and a SLEEP instruction is executed, causing a transition to software standby mode.

Software standby mode is then cleared at the rising edge on the NMI pin.

Rev. 6.00 Mar 15, 2006 page 502 of 570

REJ09B0211-0600

NMI exception

Software standby mode

(power-down mode)

SLEEP instruction

NMI exception

stabilization