UPD753108GC datasheet(11/90 Pages) NEC

Part #	UPD753108GC

Description	4-BIT SINGLE-CHIP MICROCONTROLLER

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Manufacturer	NEC [NEC]

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

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11 / 90 page

11

µPD753104, 753106, 753108

3.2 Non-port Pins (1/2)

Pin Name

Input/Output

Alternate

Function

After Reset

I/O Circuit

Function

TYPE Note 1

TI0

Input

P13

Inputs external event pulses to the timer/event

Input

(B)-C

TI1

P12/INT2/TI2

counter.

TI2

P12/INT2/TI1

PTO0

Output

P20

Timer/event counter output

Input

E-B

PTO1

P21

PTO2

P22/PCL

PCL

P22/PTO2

Clock output

BUZ

P23

Optional frequency output (for buzzer output or

system clock trimming)

SCK

Input/Output

P01

Serial clock input/output

Input

(F)-A

SO/SB0

P02

Serial data output

(F)-B

Serial data bus input/output

SI/SB1

P03

Serial data input

(M)-C

Serial data bus input/output

INT4

Input

P00

Edge detection vectored interrupt input (both

Input

(B)

rising edge and falling edge detection)

INT0

Input

P10

Input

(B)-C

INT1

P11

INT2

P12/TI1/TI2

KR0-KR3

Input

P60-P63

Falling edge detection testable input

Input

(F)-A

S0-S15

Output

–

Segment signal output

Note 2

G-A

S16-S19

Output

P93-P90

Segment signal output

Input

H

S20-S23

Output

P83-P80

Segment signal output

Input

H

COM0-COM3

Output

–

Common signal output

Note 2

G-B

VLC0-VLC2

–

LCD drive power

–

On-chip split resistor is enabled (mask option).

BIAS

Output

–

Output for external split resistor disconnect

Note 3

–

LCDCL Note 4

Output

P30

Clock output for externally expanded driver

Input

E-B

SYNC Note 4

Output

P31

Clock output for externally expanded driver

Input

E-B

synchronization

Notes 1.

Characters in parentheses indicate the Schmitt trigger input.

2.

Each display output selects the following VLCX as input source.

S0-S15: VLC1, COM0-COM2: VLC2, COM3: VLC0

3.

When a split resistor is contained ........ Low level

When no split resistor is contained ...... High-impedance

4.

These pins are provided for future system expansion.

At present, these pins are used only as pins P30 and P31.

Edge detection vectored

Noise elimination circuit/

interrupt input (detection

asynchronous selection

edge can be selected).

INT0/P10 can select noise

elimination circuit.

Rising edge detection

Asynchronous

testable input

Asynchronous

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