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M34551M4 Datasheet(PDF) 4 Page - Mitsubishi Electric Semiconductor

Part No. M34551M4
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER
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Manufacturer  MITSUBISHI [Mitsubishi Electric Semiconductor]
Direct Link  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M34551M4 Datasheet(HTML) 4 Page - Mitsubishi Electric Semiconductor

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MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
PIN DESCRIPTION
Name
Power supply
Ground
CNVSS
Reset input
Main clock input
Main clock output
Output port D
Output port D
Output port D
Output port D
I/O port P0
I/O port P1
Input port P2
Carrier wave output
for remote control
Segment output
Common output
Pin
VDD
VSS
CNVSS
RESET
XIN
XOUT
D0–D4
D5/INT
D6/XCIN
D7/XCOUT
P00–P03
P10–P13
P20/SEG16
P23/SEG19
CARR
SEG0–SEG15
COM0–COM3
Input/Output
Input
I/O
Input
Output
Output
I/O
I/O
Output
I/O
I/O
I/O
Output
Output
Output
Function
Connected to a plus power supply.
Connected to a 0 V power supply.
Connect CNVSS to VSS and apply “L” (0V) to CNVSS certainly.
An N-channel open-drain I/O pin for a system reset. A pull-up resistor is built-in
this pin. When the watchdog timer causes the system to be reset or the low-
supply voltage is detected, the RESET pin outputs “L” level.
I/O pins of the main clock generating circuit. A ceramic resonator can be connected
between XIN pin and XOUT pin. A feedback resistor is built-in between them.
Each pin of port D has an independent 1-bit wide output function. The output
structure is N-channel open-drain.
1-bit output port. Port D5 is also used as an INT input pin. When D5/INT pin is
used as the INT input pin, set the output latch to “1.” The output structure is N-
channel open-drain.
Each pin of port D has an independent 1-bit output function. Ports D6 and D7 are
also used as pins XCIN and XCOUT for the sub-clock generating circuit, respectively.
When pins D6/XCIN and D7/XCOUT are used as the pins for the sub-clock generating
circuit, a 32.0 kHz quartz-crystal oscillator can be connected between XCIN pin
and XCOUT pin. A feedback resistor is built-in between them.
4-bit I/O port. It can be used as an input port when the output latch is set to “1.”
The output structure is N-channel open-drain. Every pin of the ports has a key-on
wakeup function and a pull-up function.
4-bit I/O port. It can be used as an input port when the output latch is set to “1.”
The output structure is N-channel open-drain. Every pin of the ports has a key-on
wakeup function and a pull-up function. Both functions can be switched by software.
4-bit input port. Ports P20–P23 are also used as the segment output pins SEG16
SEG19, respectively.
Carrier wave output pin for remote control transmit. The output structure is the
CMOS circuit.
LCD segment output pins.
LCD common output pins. Pins COM0 and COM1 are used at 1/2 duty, pins COM0
COM2 are used at 1/3 duty and pins COM0–COM3 are used at 1/4 duty.


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