UPD78320 Datasheet, PDF (15/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78320, 78322
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
Pin
Input/Output
Circuit Type
P00 to P07/RTP0 to RTP7
5
P20/NMI
P21 to P26/INTP0 to INTP5
2
P27/INTP6/TI
P30/TXD
5
P31/RXD
P32/SO/SB0
P33/SI/SB1
8
P34/SCK
P40 to P47/AD0 to AD7
P50 to P57/A8 to A15
5
P70 to P77/AN0 to AN7
9
P80 to P83/TO00 to TO05
P84, P85/TO10, TO11
5
P90/RD
P91/WR
P92/TAS
5
P93/TMD
WDTO
3
ASTB
4
EA
1
RESET
2
AVREF, AVSS
––
AVDD
––
NC
––
Recommended Connection Method
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
Leave open
––
––
Connected to VSS
Connected to VDD
Connected to VSS (can also be left open)
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