HD643303x Hitachi, HD643303x Datasheet - Page 571

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

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 10
(2) To retain RAM contents with the RAME bit cleared to 0 in SYSCR, RES does not have to be
Timing of Recovery from Hardware Standby Mode: Drive the RES signal low approximately
100 ns before STBY goes high.
STBY
RES
STBY
RES
Appendix E Timing of Transition to and Recovery from
system clock cycles before the STBY signal goes low, as shown below. RES must remain low
until STBY goes low (minimum delay from STBY low to RES high: 0 ns).
driven low as in (1).
Hardware Standby Mode
t
1
t
10t
100 ns
cyc
555
t
2
0 ns
t
OSC