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M37516FE-XXXHP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

7516 Group

I/O PORTS

The I/O ports have direction registers which determine the input/

output direction of each individual pin. Each bit in a direction reg-

ister corresponds to one pin, and each pin can be set to be input

port or output port.

When “0” is written to the bit corresponding to a pin, that pin be-

comes an input pin. When “1” is written to that bit, that pin

becomes an output pin.

If data is read from a pin which is set to output, the value of the

port output latch is read, not the value of the pin itself. Pins set to

input are floating. If a pin set to input is written to, only the port

output latch is written to and the pin remains floating.

Table 5 I/O port function

Pin

Name

P00/SIN2

P01/SOUT2

P02/SCLK2

P03/SRDY2

Port P0

P04–P07

P10–P17

P20/XCOUT

P21/XCIN

Port P1

Port P2

P22/SDA1

P23/SCL1

P24/SDA2/RxD

P25/SCL2/TxD

P26/SCLK

P27/CNTR0/

SRDY1

Input/Output

Input/output,

individual

bits

I/O Structure

CMOS compatible

input level

CMOS 3-state output

CMOS compatible

input level

CMOS/SMBUS input

level (when selecting

I2C-BUS interface

function)

N-channel open-drain

output

CMOS compatible

input level

CMOS/SMBUS input

level (when selecting

I2C-BUS interface

function)

CMOS 3-state output

N-channel open-drain

output (when

selecting I2C-BUS

interface function)

CMOS compatible

input level

CMOS 3-state output

P30/AN0–

P37/AN7

P40/CNTR1

P41/INT0

P42/INT1

P43/INT2/SCMP2

Port P3

Port P4

P44/INT3/PWM

P45–P47

Non-Port Function

Serial I/O2 function I/O

Related SFRs

Serial I/O2 control

register

Sub-clock generating

circuit

I2C-BUS interface func-

tion I/O

CPU mode register

I2C control register

I2C-BUS interface func-

tion I/O

Serial I/O1 function I/O

I2C control register

Serial I/O1 control

register

Serial I/O1 function I/O

Serial I/O1 function I/O

Timer X function I/O

A-D conversion input

Serial I/O1 control

register

Serial I/O1 control

register

Timer XY mode register

A-D control register

Timer Y function I/O

External interrupt input

External interrupt input

SCMP2 output

External interrupt input

PWM output

Timer XY mode register

Interrupt edge selection

register

Interrupt edge selection

register

Serial I/O2 control

register

Interrupt edge selection

register

PWM control register

Ref.No.

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

(18)

(5)

Rev.1.01 Jul 01, 2003 page 13 of 89

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