UPD75004 データシートの表示（PDF） - NEC => Renesas Technology

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UPD75004

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75004, 75006, 75008

5. PERIPHERAL HARDWARE FUNCTIONS

5.1 PORTS

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

• CMOS input (PORT0, 1)

:8

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

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

Total

: 34

Table 5-1 Port Function

Port Name

(Symbol)

Function

PORT0

PORT1

4-bit input

PORT3*

PORT6

PORT2

PORT7

4-bit input/output

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.

PORT4*

PORT5*

4-bit input/output

(N-ch open-drain,

10 V)

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.

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.

PORT8

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

—

*: Can directly drive LED.

20

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