UPD75402ACT datasheet(14/48 Pages) NEC

14 / 48 page

µPD75402A(A)

PERIPHERAL HARDWARE FUNCTIONS

5.1

PORTS

The

µPD75402A(A) has the following three types of I/O port:

• 6 CMOS input pins (PORT0 and PORT1)

• 12 CMOS I/O pins (PORT2, PORT3, and PORT6)

• 4 N-ch open-drain I/O pins (PORT5)

Total: 22 pins

Table 5-1 Functions of Ports

Note PORT3, PORT5, and PORT6 can directly drive the LED.

Port name

PORT0

PORT1

PORT3 Note

PORT2

PORT6 Note

PORT5 Note

Function

4-bit Input

4-bit I/O

4-bit I/O (N-ch

open-drain I/O

with a withstand

voltage of 10 V)

Remarks

Also used for SO/SB0, SI, SCK, INT0, and

INT2.

—

Port 2 is also used for PCL.

This port can incorporate a pull-up

resistor as a mask option bit by bit.

Operation and feature

Allows read and test at any

time regardless of the operation

modes of dual function pins.

Allows input or output mode

setting bit by bit.

Allows input or output mode

setting in units of 4 bits.

Allows input or output mode

setting in units of 4 bits.

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