M37544 Datasheet, PDF (7/68 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

7544 Group
PIN DESCRIPTION
Table 1 Pin description
Pin
Vcc, Vss
Name
Function
Power source •Apply voltage of 4.0 to 5.5 V to Vcc, and 0 V to Vss.
Function expect a port function
VREF
Analog reference •Reference voltage input pin for A/D converter
voltage
C__N_V_s_s_
RESET
CNVss
Reset input
•Chip operating mode control pin, which is always connected to Vss.
•Reset input pin for active “L”
XIN
Clock input
•Input and output pins for main clock generating circuit
•Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins.
XOUT
Clock output
•For using RC oscillator, short between the XIN and XOUT pins, and connect the capacitor and resistor.
•If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open.
• When the on-chip oscillator is selected as the main clock, connect XIN pin to VCC and leave XOUT open.
P00/CNTR1
P01
P02
P03/TXOUT
P04–P07
I/O port P0
•8-bit I/O port.
•I/O direction register allows each pin to be individually pro-
grammed as either input or output.
•CMOS compatible input level
•CMOS 3-state output structure
• Key-input (key-on wake up
interrupt input) pins
• Timer X and timer A function
pin
•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-
termined by program.
P10/RxD
P11/TxD
P12/_S_C_{_}L_{_}K
P13/SRDY
P14/CNTR0
I/O port P1
•5-bit I/O port
•I/O direction register allows each pin to be individually pro-
grammed as either input or output.
•CMOS compatible input level
•CMOS 3-state output structure
• Serial I/O function pin
• Timer X function pin
•CMOS/TTL level can be switched for P10 and P12
P20/AN0–P25/AN5 I/O port P2
•6-bit I/O port having almost the same function as P0
• Input pins for A/D converter
•CMOS compatible input level
•CMOS 3-state output structure
P30–P33
I/O port P3
•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 P34 and P37).
•CMOS 3-state output structure
P34/INT1
P37/INT0
•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- ^{• Interrupt input pins}
termined by program.
Rev.1.04 2004.06.08 page 7 of 66
REJ03B0012-0104Z