UPD75P308 datasheet(5/34 Pages) NEC

Part #	UPD75P308

Description	4-BIT SINGLE-CHIP MICROCOMPUTER

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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µPD75P308

5

E-B

P00

Input

INT4

P01

Input/Output

SCK

P02

Input/Output

SO/SB0

P03

Input/Output

SI/SBI

P10

INT0

P11

INT1

P12

INT2

P13

TI0

P20

PTO0

P21

—

P22

PCL

P23

BUZ

P30*2

P31*2

P32*2

MD2

P33*2

MD3

P40-43*2

Input/Output

—

P50-P53*2 Input/Output

—

P60

KR0

P61

KR1

P62

KR2

P63

KR3

P70

KR4

P71

KR5

P72

KR6

P73

KR7

BP0

S24

BP1

S25

BP2

S26

BP3

S27

BP4

S28

BP5

S29

BP6

S30

BP7

S31

1. PIN FUNCTIONS

1.1 PORT PINS

4-bit input port (PORT0)

Pull-up resistors can be specified in 3-bit

units for the P01 to P03 pins by software.

Input

Input/

Output

Circuit

TYPE*1

Pin Name Input/Output

Function

8-Bit I/O

When Reset

Also Served

As

F -A

F -B

B

M -C

Input

X

Input

X

4-bit input/output port (PORT2)

Internal pull-up resistors can be

specified in 4-bit units by software.

Input

X

E-B

Input

X

MD0

LCDCL

SYNC MD1

M-A

q

High impedance

4-bit input/output port (PORT7)

Internal pull-up resistors can be

specified in 4-bit units by software.

q

Input

1-bit output port (BIT PORT)

Shared with a segment output pin.

G-C

*3

X

F -A

Input/Output

Output

Input/Output

With noise elimination function

4-bit input port (PORT1)

Internal pull-up resistors can be

specified in 4-bit units by software.

5

Programmable 4-bit input/output port

(PORT3)

This port can be specified for input/output

in bit units.

Internal pull-up resistors can be

specified in 4-bit units by software.

N-ch open-drain 4-bit input/output port

(PORT4)

Data input/output pin for writing and

verifying of program memory (PROM)

(lower 4 bits)

N-ch open-drain 4-bit input/output port

(PORT5)

Data input/output pin for writing and

verifying of program memory (PROM)

(upper 4 bits)

Programmable 4-bit input/output port

(PORT6)

This port can be specified for input/output

in bit units.

Internal pull-up resistors can be specified

in 4-bit units by software.

*1:

Circles indicate schmitt trigger inputs.

2:

Can directly drive LED.

3:

For BP0-7, VLC1 indicated below are selected as the input source.

However, the output level is changed depending on BP0-7 and the VLC1 external circuits.

B -C

Similar Part No. - UPD75P308

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