3850 datasheet(18/101 Pages) RENESAS

18 / 101 page

Rev.3.01

2003.06.20

page 18 of 98

3850 Group (Spec.A)

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

input port or output port.

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

becomes 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.

Name

Input/Output

I/O Structure

Non-Port Function

Table 9 I/O port function (spec. A)

Related SFRs

Port P0

Port P1

Port P2

P00/SIN2

P01/SOUT2

P02/SCLK2

P03/SRDY2

P04/AN5–P07AN8

P10–P17

P20/XCOUT

P21/XCIN

P22

P23

P24/RxD

P25/TxD

P26/SCLK1

P27/CNTR0/SRDY1

P30/AN0–

P34/AN4

P40/CNTR1

P41/INT0

P42/INT1

P43/INT2/SCMP2

P44/INT3/PWM

CMOS compatible

input level

CMOS 3-state output

Serial I/O2 control register

CMOS compatible

input level

CMOS 3-state output

Input/output,

individual

bits

Ref.No.

(1)

(2)

(3)

(4)

CMOS compatible

input level

N-channel open-drain

output

Port P3

Port P4

(Note)

Note: When bits 5 to 7 of Ports P3 and P4 are read out, the contents are undefined.

By setting the port P0, P1, P2 pull-up control register (address

001216), the port P3 pull-up control register (address 001316), or

the port P4 pull-up control register (address 001416), ports can

control pull-up with a program. However, the contents of these

registers do not affect ports programmed as the output ports.

Serial I/O2 function I/O

A-D conversion input

Sub-clock generating

circuit

Serial I/O1 function I/O

Timer X function I/O

A-D conversion input

Timer Y function I/O

External interrupt input

SCMP2 output

External interrupt input

PWM output

A-D control register

A-D input selection register

CPU mode register

Serial I/O1 control register

Timer XY mode register

A-D control register

A-D input selection register

Timer XY mode register

Interrupt edge selection

Serial I/O2 control register

Interrupt edge selection

PWM control register

(13)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17)

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