LC72F3661

No.0461-8/15

Pin Description

Pin name

Pin No.

I/O

Pin explanation

Equivalent circuit

PA0

PA1

PA2

PA3

26

25

24

23

I

Dedicated input ports.

These ports are designed with a low threshold voltage.

Input is disabled in Backup mode.

PB0

PB1

PB2

PB3

22

21

20

19

I/O

General-purpose I/O ports.

The mode (input or output) is set using the IOS2 instruction.

Input is disabled and the pins go to the high-impedance state in

Backup mode.

These ports are set up as general-purpose input ports after a power

on reset.

PD0/INT4

PD1/INT5

PD2

PD3

18

17

16

15

I/O

General-purpose I/O and external interrupt shared function ports.

The input formats are Schmitt inputs.

The external interrupt function is enabled when the external interrupt

enable flag is set.

• When used as general-purpose I/O ports :

The mode (input or output) is set in 1-bit units using the IOS2

instruction.

• When used as external interrupt pins :

The external interrupt functions are enabled by setting the

corresponding external interrupt enable flag (INT4EN or INT5EN).

In this case, the pins must be set to input mode in advance.

Input is disabled and the pins go to the high-impedance state in

Backup mode.

These ports are set up as general-purpose input ports after a power

on reset.

PE0

PE1

14

13

I/O

General-purpose I/O ports

The input formats are Schmitt inputs.

The mode (input or output) is set in 1-bit units using the IOS1

instruction

Input is disabled and the pins go to the high-impedance state in

Backup mode.

These ports are set up as general-purpose input ports after a power

on reset.

PF0

PF1/SCK1

PF2/SO1

PF3/SI1

PG0

PG1/SCK0

PG2/SO0

PG3/SI0

12

11

10

9

8

7

6

5

I/O

General-purpose I/O ports with shared functions as serial I/O ports.

The input formats are Schmitt inputs.

The IOS1 instruction is used to switch between the general-purpose

I/O port and serial I/O port functions.

• When used as general-purpose I/O ports :

The pins are set to the general-purpose I/O port function using the

IOS1 instruction.

The mode (input or output) is set in 1-bit units using the IOS1

instruction

• When used serial I/O ports :

The pins are set to the serial I/O port function using the IOS1

instruction.

[Pin states when set to the serial I/O port function]

PF0, PG0 … General-purpose I/O

PF1, PG1 … SCK input or output

PF2, PG2 … SO output

PF3, PG3 … SI input

Input is disabled and the pins go to the high-impedance state in

Backup mode.

These ports are set up as general-purpose input ports after a power

on reset.

Continued on next page.

ILC05529

BACK UP

ILC05530

BACK UP

ILC05532

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