M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 7

• Manufacturer Part Number: M37544
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev.1.04
REJ03B0012-0104Z
7544 Group
PIN DESCRIPTION
Table 1 Pin description
P2
P3
P3
P3
Vcc, Vss
V
CNVss
______
RESET
X
X
P0
P0
P0
P0
P0
P1
P1
P1
P1
P1
REF
IN
OUT
0
3
0
4
7
0
1
2
3
4
0
1
2
4
/AN
/S
–P3
/INT
/INT
/CNTR
/TX
–P0
/RxD
/TxD
/S
/CNTR
____
RDY
Pin
CLK
0
OUT
3
7
1
0
–P2
1
0
2004.06.08
5
/AN
5
I/O port P2
I/O port P3
Power source
Analog reference
voltage
CNVss
Reset input
Clock input
Clock output
I/O port P0
I/O port P1
Name
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•Apply voltage of 4.0 to 5.5 V to Vcc, and 0 V to Vss.
•Reference voltage input pin for A/D converter
•Chip operating mode control pin, which is always connected to Vss.
•Reset input pin for active “L”
•Input and output pins for main clock generating circuit
•Connect a ceramic resonator or quartz-crystal oscillator between the X
•For using RC oscillator, short between the X
•If an external clock is used, connect the clock source to the X
• When the on-chip oscillator is selected as the main clock, connect X
•8-bit I/O port.
•I/O direction register allows each pin to be individually pro-
•CMOS compatible input level
•CMOS 3-state output structure
•P0 can output a large current for driving LED.
•Whether a built-in pull-up resistor is to be used or not can be de-
•5-bit I/O port
•I/O direction register allows each pin to be individually pro-
•CMOS compatible input level
•CMOS 3-state output structure
•CMOS/TTL level can be switched for P1
•6-bit I/O port having almost the same function as P0
•CMOS compatible input level
•CMOS 3-state output structure
•6-bit I/O port
•I/O direction register allows each pin to be individually programmed as either input or output.
•CMOS compatible input level (CMOS/TTL level can be switched for P3
•CMOS 3-state output structure
•P3 can output a large current for driving LED.
•Whether a built-in pull-up resistor is to be used or not can be de-
grammed as either input or output.
termined by program.
grammed as either input or output.
termined by program.
0
and P1
IN
and X
Function
2
OUT
pins, and connect the capacitor and resistor.
IN
pin and leave the X
IN
• Serial I/O function pin
• Timer X function pin
• Input pins for A/D converter
• Interrupt input pins
Function expect a port function
• Key-input (key-on wake up
• Timer X and timer A function
pin to V
interrupt input) pins
pin
IN
4
and P3
and X
CC
and leave X
OUT
7
).
OUT
pins.
pin open.
OUT
open.