7516 datasheet(13/90 Pages) RENESAS

13 / 90 page

Rev.1.01

Jul 01, 2003

page 13 of 89

7516 Group

Name

Input/Output

I/O Structure

Non-Port Function

Ref.No.

Table 5 I/O port function

Related SFRs

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.

Port P0

Port P1

Port P3

Input/output,

individual

bits

CMOS compatible

input level

CMOS 3-state output

Sub-clock generating

circuit

CPU mode register

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(12)

Port P2

Port P4

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

I2C-BUS interface func-

tion I/O

I2C-BUS interface func-

tion I/O

Serial I/O1 function I/O

I2C control register

Serial I/O1 control

Timer XY mode register

A-D control register

Timer XY mode register

Interrupt edge selection

Serial I/O2 control

Interrupt edge selection

PWM control register

External interrupt input

PWM output

P00/SIN2

P01/SOUT2

P02/SCLK2

P03/SRDY2

P04–P07

P10–P17

P20/XCOUT

P21/XCIN

P22/SDA1

P23/SCL1

Serial I/O2 control

Serial I/O2 function I/O

P24/SDA2/RxD

P25/SCL2/TxD

P26/SCLK

(13)

P27/CNTR0/

SRDY1

Serial I/O1 function I/O

Timer X function I/O

A-D conversion input

Timer Y function I/O

External interrupt input

P30/AN0–

P37/AN7

P40/CNTR1

P41/INT0

P42/INT1

P43/INT2/SCMP2

External interrupt input

SCMP2 output

P44/INT3/PWM

P45–P47

(14)

(15)

(16)

(17)

(18)

(5)

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