MITSUBISHI MICROCOMPUTERS
7477/7478 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
X
CIN
Data bus
(Note)
1/2
Timer 1 latch (8)
1/2
T12M
2
1/8
XIN
CM
7
T12M
0
Timer 1
interrupt request
P3
2
/CNTR
0
0
Timer 1 (8)
EG
Port latch
2
T12M
1
TM2
0
1/2
P12/T
T12M
3
Timer 2 latch (8)
Timer 2 (8)
T12M
T12M
6
7
T12M
4
Timer 2
interrupt request
T12M
5
1/4
1/8
TM2
6
T34M
T34M
1
2
1/16
Timer 3 latch (8)
Timer 3 (8)
T34M
0
Timer 3
interrupt request
P3
2/CNTR
1
EG
3
T34M
T34M
4
5
Timer 4 latch (8)
Timer 4 (8)
Timer 4
interrupt request
T34M
6
Port latch
EG
4
F/F
1/2
T34M
3
P13/T1
T34M
7
TM2
7
TM2
1
EG
EG
EG
EG
3
2
1
0
P3
3
2
/CNTR
/CNTR
1
0
C
P3
D3 Q3
D2 Q2
D1 Q1
D0 Q0
P3
P3
1
0
/INT
/INT
1
0
(
Select gate : At reset, shaded side is connected.)
Note : The 7477 group does not have XCIN input.
Fig. 6 Block diagram of timer 1 through 4
15
MITSUBISHI [ Mitsubishi Group ]
