H8SSLASH2225 datasheet(880/1071 Pages) RENESAS

部件名	H8S/2225

功能描述	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	1071 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

标志

880 / 1071 page

Section 24 Power-Down Modes

Rev. 5.00 Aug 08, 2006 page 794 of 982

REJ09B0054-0500

24.4.4

Software Standby Mode Application Example

Figure 24.3 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

settling

time tOSC2

NMI exception

handling

Figure 24.3 Software Standby Mode Application Example

H8S/2225 数据表(PDF) 880 Page - Renesas Technology Corp