UPD78323LP datasheet(14/86 Pages) NEC

14 / 86 page

µPD78323, 78324

1.3

PIN INPUT/OUTPUT CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS

The pin input/output circuits, partly simplified, are shown in Table 1-1 and Figure 1-1.

Table 1-1. I/O Circuit Types of Pins and Their Recommended

Connection Methods when Unused

Recommended Connection Method

Input/Output

Circuit Type

P00/RTP0 to P07/RTP7

P20/NMI

P21/INTP0 to P26/INTP5

P27/INTP6/TI

P30/TXD

P31/RXD

P32/SO/SB0

P33/SI/SB1

P34/SCK

P40/AD0 to P47/AD7

P50/A8 to P57/A15

P70/AN0 to P77/AN7

P80/TO00 to P83/TO03

P84/TO10, P85/TO11

P90/RD

P91/WR

P92/TAS

P93/TMD

WDTO

ASTB

RESET

AVREF, AVSS

AVDD

Input mode : Individually connected to VDD or VSS via resistor

Output mode: Leave open

Connected to VSS

––

Input mode : Individually connected to VDD or VSS via resistor

Output mode: Leave open

Connected to VSS

Input mode : Individually connected to VDD or VSS via resistor

Output mode: Leave open

Leav open

––

Connected to VSS

Connected to VDD

Connected to VSS (can also be left open)

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