H8S2245 datasheet(811/818 Pages) RENESAS

Part #	H8S2245

Description	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

PDF	818 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Appendix F Timing of Transition to and Recovery from Hardware Standby Mode

Rev.3.00 Mar. 26, 2007 Page 769 of 772

REJ09B0355-0300

Appendix F Timing of Transition to and Recovery from

Hardware Standby Mode

Timing of Transition to Hardware Standby Mode

(1) To retain RAM contents with the RAME bit set to 1 in SYSCR, drive the

RES signal low at

least 10 states before the

STBY signal goes low, as shown figure F.1. RES must remain low

until

STBY goes low (delay from STBY fall to RES rise: minimum 0 ns).

STBY

RES

t1 ≥ 10 tcyc

t2 ≥ 0 ns

Figure F.1 Timing of Transition to Hardware Standby Mode

(2) To retain RAM contents with the RAME bit cleared to 0 in SYSCR, or when RAM contents do

not need to be retained,

RES does not have to be driven low as in (1).

Timing of Recovery from Hardware Standby Mode

Drive the

RES signal low and the NMI signal high approximately 100 ns or more before STBY

goes high, and execute a power-on reset.

tNMIRH

tOSC

≥ 100 ns

STBY

RES

NMI

Figure F.2 Timing of Recovery from Hardware Standby Mode

H8S2245 Datasheet(PDF) 811 Page - Renesas Technology Corp