UPD75112 datasheet(10/56 Pages) NEC

Part #	UPD75112

Description	4-Bit Single Chip-Microcomputer

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Manufacturer	NEC [NEC]

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µPD75112(A), 75116(A)

3.5 Caution Relating to Use of P00/INT4 Pin and RESET Pin

In addition to the functions described in sections 3.1

and 3.2, the P00/INT4 pin and the RESET pin have the

function to set the IC test mode for testing the

µPD75116(A) internal operations.

When a voltage larger than VDD is applied to one of

these two pins, the test mode is set. Thus, if noise

exceeding VDD is applied even during normal opera-

tions, the test mode is set and normal operations may

be discontinued.

For example, if a cable from the P00/INT4 or RESET pin

is too long, inter-wiring noise may be applied to the pin,

the pin voltage may become larger than VDD, causing

malfunctioning.

Thus, carry out wiring to minimize inter-wiring noise. If

the noise cannot be suppressed completely, carry out

the following countermeasure against noise using an

externally mounted component.

o Connect a diode with low VF (max 0.3 V)between VDDs

Diode with low VF

o Connect acapacitor between VDDs

3.4 Recommended Connection of Unused Pins

PTH00 to PTH03

TI0

TI1

P00

P01 to P03

P10 to P13

P20 to P23

P30 to P33

P40 to P43

P50 to P53

P60 to P63

P70 to P73

P80 to P83

P90 to P93

P120 to P123

P130 to P133

P140 to P143

RESET

NC

*1: Only when a power-on reset generator is built in by mask

option, connect t VDD.

2: When the PWB is shared with the

µPD75P116, connect the

NC pin to VDD directly.

Recommended Connecting Method

Connect to VSS or VDD

Connect to VSS

Connect to VSS or VDD

Connect to VSS

Input state

: Connect to VSS or VDD

Output state : Leave open

Connect to VDD*1

Leave open or connect to VDD*2

VDD

P00/INT4, RESET

VDD

P00/INT4, RESET

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