HD6432351 datasheet(731/1025 Pages) RENESAS

Il numero della parte	HD6432351

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer

PDF	1025 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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Section 20 Power-Down Modes

Rev. 3.00 Sep 15, 2006 page 697 of 988

REJ09B0330-0300

20.6.4

Software Standby Mode Application Example

Figure 20.2 shows an example in which a transition is made to software standby mode at the

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

Oscillator

NMI

NMIEG

SSBY

NMI exception

handling

NMIEG = 1

SSBY = 1

SLEEP instruction

Software standby mode

(power-down mode)

Oscillation

stabilization

time tOSC2

NMI exception

handling

Figure 20.2 Software Standby Mode Application Example

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