Test Circuits

No. 5931-7/14

LC723732/40/48/56/64

Note: Ports PB through PG, and PJ through PT are all left open.

However, ports PB through PG, PK through PT, EO3, and

SUBPD are left open in output mode.

Note: Ports PA through PT are all left open.

Figure 1 IDD2 in Halt Mode

Figure 2 IDD3 and IDD4 in Backup Mode

Pin Descriptions

Pin No.

Symbol

I/O

Function

Equivalent circuit

Dedicated input ports.

These ports are designed with a low threshold voltage.

The pull-down resistors for all four pins are set up together with an IOS1 instruction.

The pull-down resistors cannot be set individually.

Input is disabled in backup mode.

32

31

30

29

PA0

PA1

PA2

PA3

I

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.

28

27

26

25

PB0

PB1

PB2

PB3

I/O

General-purpose I/O ports (high-voltage input and output)

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

External pull-up resistors are required since the output circuits are open drain

circuits.

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.

24

23

22

21

PC0

PC1

PC2

PC3

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). Here, 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.

20

19

18

17

PD0/INT4

PD1/INT5

PD2

PD3

I/O

Continued on next page.