4554 Datasheet, PDF (57/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 Group
High-speed mode
E
Clock operating mode
POF instruction
execution
Key-on wakeup
(Stabilizing time c )
POF instruction
execution
(Stabilizing time a )
Key-on wakeup
(Stabilizing time b )
POF instruction
execution
Key-on wakeup
(Stabilizing time d )
B
Operation state
• Operation source clock: f(XIN)
• Oscillation circuit:
Ceramic resonator
• On-chip oscillator: Stop
• RC oscillation circuit: Stop
CMCK instruction
execution (Note 3)
A
Operation state
• Operation source clock:
f(RING)
• Oscillation circuit:
On-chip oscillator
• Ceramic resonator:
Operating (Note 2)
• RC oscillation circuit: Stop
CRCK instruction
execution (Note 3)
C
Operation state
• Operation source clock: f(XIN)
• Oscillation circuit:
RC oscillation
• On-chip oscillator: Stop
• Ceramic resontor: Stop
POF2 instruction
execution
F
RAM back-up mode
Key-on wakeup
(Stabilizing time c )
POF2 instruction
execution
Key-on wakeup
(Stabilizing time b )
POF2 instruction
execution
Key-on wakeup
(Stabilizing time d )
Main clock: stop
Sub-clock: operating
Low-speed _{MR0←1 MR0←0}
mode
(Note 4) (Note 4)
POF instruction
execution
Key-on wakeup
(Stabilizing time e )
D
Operation state
• Operation clock: f(XCIN)
• Oscillation circuit:
Quartz-crystal oscillation
POF2 instruction
execution
Key-on wakeup
(Stabilizing time e )
Main clock: stop
Sub-clock: stop
Stabilizing time a : Microcomputer starts its operation after counting the on-chip oscillator clock 5400 to 5424 times.
Stabilizing time b : In high-speed through-mode, microcomputer starts its operation after counting the f(RING) 675 times.
In high-speed/2 mode, microcomputer starts its operation after counting the f(RING) 1350 times.
In high-speed/4 mode, microcomputer starts its operation after counting the f(RING) 2700 times.
In high-speed/8 mode, microcomputer starts its operation after counting the f(RING) 5400 times.
Stabilizing time c : In high-speed through-mode, microcomputer starts its operation after counting the f(XIN) 675 times.
In high-speed/2 mode, microcomputer starts its operation after counting the f(XIN) 1350 times.
In high-speed/4 mode, microcomputer starts its operation after counting the f(XIN) 2700 times.
In high-speed/8 mode, microcomputer starts its operation after counting the f(XIN) 5400 times.
Stabilizing time d : In high-speed through-mode, microcomputer starts its operation after counting the f(XIN) 21 times.
In high-speed/2 mode, microcomputer starts its operation after counting the f(XIN) 42 times.
In high-speed/4 mode, microcomputer starts its operation after counting the f(XIN) 84 times.
In high-speed/8 mode, microcomputer starts its operation after counting the f(XIN) 168 times.
Stabilizing time e : In low-speed through-mode, microcomputer starts its operation after counting the f(XCIN) 675 times.
In low-speed/2 mode, microcomputer starts its operation after counting the f(XCIN) 1350 times.
In low-speed/4 mode, microcomputer starts its operation after counting the f(XCIN) 2700 times.
In low-speed/8 mode, microcomputer starts its operation after counting the f(XCIN) 5400 times.
Notes 1: Continuous execution of the EPOF instruction and the POF instruction is required to go into the clock operating state.
Continuous execution of the EPOF instruction and the 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.
4: The main clock (f(XIN) or f(RING)) or sub-clock (f(XCIN)) is selected for operation source clock by the bit 0 of clock control register MR.
5: The sub-clock (quartz-crystal oscillation) is operating except in state F.
Fig. 44 State transition
POF or
EPOF instruction + _POF2
instruction
Reset input
Power down flag P
SQ
R
POF or
q Set source ^{• • • • • • •} EPOF instruction + POF2
instruction
q Clear source• • • • • • Reset input
Fig. 45 Set source and clear source of the P flag
Rev.3.00 Aug 06, 2004 page 57 of 136
REJ03B0043-0300Z
Program start
Yes
P = “1”
?
No
Cold start
Return from
timer 5 underflow
Warm start
Yes
T5F = “1”
?
No
Return from
external wakeup signal
Fig. 46 Start condition identified example using the SNZP instruction