4507 Datasheet, PDF (41/115 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4507 Group
B
Operating
POF2 instruction execution
Operation source clock:
ceramic resonator
On-chip oscillator: stop
RC oscillation circuit: stop
Key-on wakeup
(Stabilizing time b )
(Stabilizing
Reset ^{time a )}
CMCK instruction
execution (Note 3)
A
Operating
POF2 instruction execution
Operation source clock:
on-chip oscillator clock
Ceramic resonator:
operating (Note 2)
RC oscillation circuit: stop
Key-on wakeup
(Stabilizing time a )
CRCK instruction
execution (Note 3)
C
Operating
POF2 instruction execution
Operation source clock:
RC oscillation
On-chip oscillator: stop
Ceramic resonator: stop
Key-on wakeup
(Stabilizing time c )
E
RAM back-up
(All functions of
microcomputer stop)
Operation source clock: stop
Stabilizing time a : Microcomputer starts its operation after counting the on-chip oscillator clock 5359 times by hardware.
Stabilizing time b : Microcomputer starts its operation after counting the f(XIN) 5359 times by hardware.
Stabilizing time c : Microcomputer starts its operation after counting the f(XIN) 165 times by hardware.
Notes 1: Continuous execution of the EPOF instruction and POF2 instruction is required to go into the RAM back-up state.
2: Through the ceramic resonator is operating, the on-chip oscillator clock is selected as the operation source clock.
3: The oscillator clock corresponding to each instruction is selected as the operation source clock,
and the on-chip oscillator is stopped.
Fig. 37 State transition
EPOF
instruction
+
POF2
instruction
Power down flag P
SQ
Reset input
R
q Set source ^{• • • • • • •} EPOF instruction + POF2 instruction
q Clear source• • • • • • Reset input
Program start
P = “1”
Yes
?
No
Cold start
Warm start
Fig. 38 Set source and clear source of the P flag
Fig. 39 Start condition identified example using the SNZP in-
struction
Rev.3.01 2005.02.04 page 41 of 111
REJ03B0107-0301