UPD75004 datasheet(20/66 Pages) NEC

20 / 66 page

µPD75004, 75006, 75008

PERIPHERAL HARDWARE FUNCTIONS

5.1

PORTS

I/O ports are classified into the following 3 kinds:

• CMOS input (PORT0, 1)

• CMOS input/output (PORT2, 3, 6, 7, and 8) : 18

• N-ch open-drain input/output (PORT4, 5) : 8

Total

: 34

Remarks

Multiplexed with SO/SB0,

SI/SB1, SCK, INT0-2, 4,

and TIO

Port 6 is multiplexed with

KR0 to KR3.

Port 2 is multiplexed with

PTO0, PCL, and BUZ.

Port 7 is multiplexed with

KR4-KR7.

Can be connected to a

pull-up resistor in 1-bit

units by using mask

option.

—

PORT0

PORT1

PORT3*

PORT6

PORT2

PORT7

PORT4*

PORT5*

PORT8

Function

4-bit input

4-bit input/output

(N-ch open-drain,

10 V)

2-bit input/output

Table 5-1 Port Function

Operation and Feature

Can be always read or tested regardless of opera-

tion mode of multiplexed pin.

Can be set in input or output mode in 1-bit units.

Can be set in input or output mode in 4-bit units.

Ports 6 and 7 are used in pairs to input/output data

in 8-bit units.

Can be set in input or output mode in 4-bit units.

Ports 4 and 5 are used in pairs to input/output data

in 8-bit units.

Can be set input or output mode in 2-bit units.

*: Can directly drive LED.

Port Name

(Symbol)

UPD75004 Datasheet(PDF) 20 Page - NEC

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