HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 485

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Timing of Transition to Hardware Standby Mode
(1) To retain RAM contents when the RAME bit in RAMCR is set to 1, drive the RES signal line
(2) When the RAME bit in RAMCR is cleared to 0, or when it is not necessary to retain RAM
Timing of Exit from Hardware Standby Mode
Drive the RES signal line low approximately 100 ns before the rise of the STBY signal.
Appendix F Timing of Transition to and Recovery from
low 10 system clock cycles before the STBY signal, at a time when RAM is not being
accessed.
contents, RES need not be driven low as in (1).
STBY
RES
STBY
RES
Hardware Standby Mode
t
1
t
10 t
100 ns
475
cyc
t
2
0 ns
t
OSC