HD6432646 Hitachi, HD6432646 Datasheet - Page 1151
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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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
(2) To retain RAM contents with the RAME bit cleared to 0 in SYSCR, or when RAM contents do
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 to execute a power-on reset.
Appendix E Timing of Transition to and Recovery from
least 10 states before the STBY signal goes low, as shown below. RES must remain low until
STBY signal goes low (delay from STBY low to RES high: 0 ns or more).
not need to be retained, RES does not have to be driven low as in (1).
STBY
RES
STBY
RES
NMI
Figure E-2 Timing of Recovery from Hardware Standby Mode
Figure E-1 Timing of Transition to Hardware Standby Mode
Hardware Standby Mode
t
1
10t
t 100ns
cyc
t
2
0ns
t
OSC
t
NMIRH
1117
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