
35
MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
(8) State transition
State transition is described using Figure 36.
Fig. 36 State transition
MR
0
←
0
B
MR
0
←
1
C
MR
1
←
1
MR
1
←
0
D
K
A
MR
2
←
1
MR
0
←
0
F
MR
0
←
1
G
MR
1
←
1
MR
1
←
0
H
MR
2
←
0
E
MR
2
←
1
MR3
← 1
MR3
← 0
MR3
← 1
MR3
← 0
MR3
← 1
MR3
← 0
MR3
← 1
MR3
← 0
(Note 2)
(Stabilizing
time
c
)
(Stabilizing
time
c
)
J
f(XIN):Stop
f(XCIN) :
Oscillation
I
(Stabilizing
time
c )
(Stabilizing
time
c )
(Stabilizing
time
d ) (Stabilizing
time
d )
B
, F
C
, G
D
, H
B
, F
C
, G
D
, H
A
, E
A
, E
B
, F
C
, G
D
, H
B
, F
C
, G
D
, H
A
, E
(Note 2)
Reset
POF execution
Return input 1
(Stabilizing time a )
POF execution
Return input 1, 2
(Stabilizing time a )
POF execution
Return input 1, 2
(Stabilizing time c )
(Note 1)
Clock
operating
mode
POF execution
Return input 1, 2
(Stabilizing time c )
(Note 1)
f(XIN):Stop
f(XCIN):Stop
Clock
operating
mode
f(XIN):Oscillation
f(XCIN):Stop
System clock;
f(XIN)/4
MR=(10002)
MR
2
←
0
f(XIN):Oscillation
f(XCIN):Oscillation
f(XIN):Oscillation
f(XCIN):Oscillation
f(XIN):Stop
f(XCIN):Oscillation
System clock;
f(XIN)/4
MR=(11002)
System clock;
f(XCIN)/4
MR=(11012)
System clock;
f(XCIN)/4
MR=(11112)
f(XIN):Oscillation
f(XCIN):Stop
System clock;
f(XIN)
MR=(00002)
f(XIN):Oscillation
f(XCIN):Oscillation
System clock;
f(XIN)
MR=(01002)
f(XIN):Oscillation
f(XCIN):Oscillation
System clock;
f(XCIN)
MR=(01012)
f(XIN):Stop
f(XCIN):Oscillation
System clock;
f(XCIN)
MR=(01112)
(Stabilizing
time
d
)
(Stabilizing
time
d
)
(Note 2)
POF2 execution
Return input 1
(Stabilizing time a )
POF2 execution
Return input 1
(Stabilizing time a )
POF2 execution
Return input 1
(Stabilizing time b )
POF2 execution
Return input 1
(Stabilizing time b )
f(XIN):Stop
f(XCIN):Stop
RAM
back-up
mode
Stabilizing time a : An interval required to stabilize the f(XIN) oscillation is automatically generated by hardware.
Stabilizing time b : An interval required to stabilize the f(XCIN) oscillation is automatically generated by hardware.
Stabilizing time c : Generate an interval required to stabilize the f(XIN) oscillation in state C or G by software at the
transition D
→C, D→G, H→C, H→G, J→C, or J→G.
Stabilizing time d : Generate an interval required to stabilize the f(XCIN) oscillation in state B, F by software at the
transition A
→B, E→F, A→F, or E→B.
Return input 1: External wakeup signal (P00–P03, P10–P13)
Return input 2: Timer 2 interrupt request flag
Notes 1. MR3=“1”
→The microcomputer starts its operation after counting f(XCIN) clock signal 59 to 70 times.
MR3=“0”
→The microcomputer starts its operation after counting f(XCIN) clock signal 32 to 43 times.
2. When the following 2 conditions are satisfied, the transition A
→E, B→F, A→F, C→F, G→F represented
by “
” can be executed.
(1) VDD = 2.2 V to 5.5 V (One Time PROM version: VDD = 2.5 V to 5.5 V), f(XIN)
≤ 1.0 MHz
(2) VDD = 4.5 V to 5.5 V, f(XIN)
≤ 2.0 MHz
A
, E
MR
2 ←
0
MR
3 ←
0
MR
2 ←
1
MR
3 ←
1
(Note 2)
MR
2
←
1
MR
2
←
0
MR
3
←
0
MR
3
←
1
MR
3
←
1
MR
0
←
0
MR
3
←
0
MR
0
←
1
MR
0 ←
1
MR
0 ←
0
MR
3 ←
1
MR
3 ←
0
MR
3
←
1
MR
1
←
0
MR
3
←
0
MR
1
←
1
MR
1 ←
0
MR
3 ←
0
MR
1 ←
1
MR
3 ←
1