MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
PORT BLOCK DIAGRAMS
Register Y
Decoder
(Note 1)
S
R
Q
SD instruction
RD instruction
Ports D0–D6
CLD instruction
Register Y
Decoder
(Note 1)
S
R
SD instruction
RD instruction
Q
Port D7 (Note 4)
CLD instruction
Pull-down
transistor
Skip decision (SZD instruction)
Key-on wakeup input
PU0
2
Register A
(Note 1)
Port E
A0
Q
D
T
OEA
instruction
IAE instruction
0
(Note 4)
A0
Pull-down
transistor
Key-on wakeup input
PU0
0
Register A
(Note 1)
Q
D
T
A1
OEA
instruction
IAE instruction
Port E1 (Note 4)
A1
Pull-down
transistor
Key-on wakeup input
PU0
IAE instruction
1
Register A
A2
Port E2 (Note 4)
(Note 1)
Key-on wakeup input
Pull-down
transistor
Register A
D
T
Q
A
i
(Note 1)
OGA
instruction
(Note 2)
Ports G0–G3 (Note 4)
IAG instruction
Ai
Pull-down
transistor
Key-on wakeup input
TCA instruction
Register A
TAC instruction
To timer 1
Register A
CARRY
(Note 1)
Aj
Aj
(Note 3)
(Note 3)
Register C
Carrier wave
output circuit
Port CARR
Register A
A3
Q
R
D
T
TCA
instruction
OCRA instruction
Timer 1 underflow signal
D
T
Q
R
Carrier wave
output control
signal
V1
2
V10
Notes 1:
This symbol represents a parasitic diode.
2: i represents bits 0 to 3.
3: j represents bits 0 to 2.
4: Applied voltage must be less than VDD
.
MITSUBISHI
ELECTRIC
5
MITSUBISHI [ Mitsubishi Group ]
