LC872H08A/06A/04A

No.A1540-9/28

Continued from preceding page.

Pin Name

I/O

Description

Option

Port 7

• 4-bit I/O port

• I/O specifiable in 1-bit units

• Pull-up resistors can be turned on and off in 1-bit units.

• Pin functions

P70: INT0 input/HOLD reset input/timer 0L capture input/watchdog timer output

P71: INT1 input/HOLD reset input/timer 0H capture input

P72: INT2 input/HOLD reset input/timer 0 event input/timer 0L capture input

P73: INT3 input (input with noise filter)/timer 0 event input/timer 0H capture input

P70(AN8),P71(AN9) : AD converter input

Interrupt acknowledge types

Rising

Falling

Rising &

Falling

H level

L level

INT0

enable

enable

disable

enable

enable

INT1

enable

enable

disable

enable

enable

INT2

enable

enable

enable

disable

disable

INT3

enable

enable

enable

disable

disable

P70 to P73

I/O

No

RES

I/O

External reset Input/internal reset output

No

CF1/XT1

I

• Ceramic resonator or 32.768kHz crystal oscillator input pin

• Pin function

General-purpose input port

No

CF2/XT2

I/O

• Ceramic resonator or 32.768kHz crystal oscillator output pin

• Pin function

General-purpose input port

No

Port Output Types

The table below lists the types of port outputs and the presence/absence of a pull-up resistor.

Data can be read into any input port even if it is in the output mode.

Port Name

Option selected in

units of

Option type

Output type

Pull-up resistor

1

CMOS

Programmable (Note 1)

P00 to P07

1 bit

2

Nch-open drain

No

1

CMOS

Programmable

P10 to P17

1 bit

2

Nch-open drain

Programmable

1

CMOS

Programmable

P20 to P21

1 bit

2

Nch-open drain

Programmable

1

CMOS

Programmable

P30 to P31

1 bit

2

Nch-open drain

Programmable

P70

-

No

Nch-open drain

Programmable

P71 to P73

-

No

CMOS

Programmable

Note 1: The control of the presence or absence of the programmable pull-up resistors for port 0 and the switching

between low-and high-impedance pull-up connection is exercised in nibble (4-bit) units (P00 to 03 or P04 to

07).