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M37516E6HP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

7516 Group

Table 1 Pin description

Pin

VCC, VSS

CNVSS

VREF

AVss

RESET

XIN

Name

Power source

CNVSS input

Reference

voltage input

Analog power

source input

Reset input

Clock input

XOUT

Clock output

P00/SIN2

P01/SOUT2

P02/SCLK2

P03/SRDY2

P04–P07

P10–P17

P20/XCOUT

P21/XCIN

P22/SDA1

P23/SCL1

P24/SDA2/RxD

P25/SCL2/TxD

P26/SCLK

P27/CNTR0/

SRDY1

I/O port P0

I/O port P1

I/O port P2

P30/AN0–

P37/AN7

I/O port P3

P40/CNTR1

P41/INT0

P42/INT1

P43/INT2/SCMP2

P44/INT3/PWM

P45–P47

I/O port P4

Functions

•Apply voltage of 2.7 V – 5.5 V to Vcc, and 0 V to Vss.

•This pin controls the operation mode of the chip.

•Normally connected to VSS.

•Reference voltage input pin for A-D converter.

Function except a port function

•Analog power source input pin for A-D converter.

•Connect to Vss.

•Reset input pin for active “L”.

•Input and output pins for the clock generating circuit.

•Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set

the oscillation frequency.

•When an external clock is used, connect the clock source to the XIN pin and leave the XOUT

pin open.

•8-bit CMOS I/O port.

• Serial I/O2 function pin

•I/O direction register allows each pin to be individually

programmed as either input or output.

•CMOS compatible input level.

•CMOS 3-state output structure.

•P10 to P17 (8 bits) are enabled to output large current for LED drive.

•8-bit CMOS I/O port.

• Sub-clock generating circuit I/O

•I/O direction register allows each pin to be individually pins (connect a resonator)

programmed as either input or output.

• I2C-BUS interface function pins

•CMOS compatible input level.

•P22 to P25 can be switched between CMOS compat-

ible input level or SMBUS input level in the I2C-BUS

interface function.

•P20, P21, P24 to P27: CMOS 3-state output structure.

•P24, P25: N-channel open-drain structure in the I2C-

BUS interface function.

• I2C-BUS interface function pin/

Serial I/O1 function pins

• Serial I/O1 function pin

• Serial I/O1 function pin/

Timer X function pin

•P22, P23: N-channel open-drain structure.

•8-bit CMOS I/O port with the same function as port P0. • A-D converter input pin

•CMOS compatible input level.

•CMOS 3-state output structure.

•8-bit CMOS I/O port with the same function as port P0. • Timer Y function pin

•CMOS compatible input level.

• Interrupt input pins

•CMOS 3-state output structure.

• Interrupt input pin/SCMP2 output pin

• Interrupt input pin/PWM output pin

Rev.1.01 Jul 01, 2003 page 3 of 89

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