M3885 datasheet(14/103 Pages) RENESAS

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3885 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Name

Input/Output

I/O Structure

Non-Port Function

Ref.No.

Table 6 I/O port function (1)

Related SFRs

I/O PORTS

All I/O pins are programmable as input or output. All I/O ports

have direction registers which specify the data direction of each

pin like input/output. One bit in a direction register corresponds to

one pin. Each pin can be set to be input or output port.

Writing “0” to the bit corresponding to the pin, that pin becomes an

input mode. Writing “1” to the bit, that pin becomes an output

mode.

When the data is read from the bit of the port register correspond-

ing to the pin which is set to output, the value shows the port latch

data, not the input level of the pin. When a pin set to input, the pin

comes floating. In input port mode, writing the port register

changes only the data of the port latch and the pin remains high

impedance state.

When the P8 function selection bit of the port control register 2 is

set to “1”, reading from address 001016 reads the port P4 register,

and reading from address 001116 reads the port P7 register.

Especially, the input level of P42 to P46 pins and P70 to P75 pins

can be read regardless of the data of the direction registers in this

case.

P00-P07

P10–P17

P20/CMPREF

Port P0

Port P1

CMOS compatible

input level

CMOS 3-state output

or N-channel open-

drain output

Analog comparator

power source input pin

Port control register 1

(1)

(2)

Port control register 1

Port control register 2

P21–P27

P30/PWM00

P31/PWM10

Port P2

CMOS compatible

input level

CMOS 3-state output

(3)

(4)

(5)

Port control register 1

AD/DA control register

PWM output

Key-on wake up input

Comparator input

P32–P37

Port P3

(6)

Key-on wake up input

Comparator input

Port control register 1

P40/XCOUT

P41/XCIN

P42/INT0

P43/INT1

P44/RXD

Input/output,

individual bits

(7)

(8)

(9)

(10)

(11)

Sub-clock generating

circuit

CPU mode register

External interrupt input

Interrupt edge selection

Port control register 2

Serial I/O control register

Port control register 2

Serial I/O function input

P45/TXD

Port P4

CMOS compatible

input level

CMOS 3-state output

or N-channel open-

drain output

(12)

Serial I/O control register

UART control register

Port control register 2

Serial I/O function output

P46/SCLK

(13)

Serial I/O control register

Port control register 2

Serial I/O function I/O

P47/SRDY

/CLKRUN

Serial I/O control register

Serialized IRQ control

Serial I/O function output

Serialized IRQ function

output

(14)

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