UPD78323 NEC, UPD78323 Datasheet - Page 14

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

14
1.3
The pin input/output circuits, partly simplified, are shown in Table 1-1 and Figure 1-1.
PIN INPUT/OUTPUT CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS
P00/RTP0 to P07/RTP7
P20/NMI
P21/INTP0 to P26/INTP5
P27/INTP6/TI
P30/T
P31/R
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
EA
RESET
AV
AV
NC
REF
DD
, AV
X
X
D
D
SS
Pin
Table 1-1. I/O Circuit Types of Pins and Their Recommended
Connection Methods when Unused
Input/Output
Circuit Type
––
––
––
5
2
5
8
5
9
5
5
3
4
1
2
Input mode : Individually connected to V
Output mode: Leave open
Connected to V
Input mode : Individually connected to V
Output mode: Leave open
Connected to V
Input mode : Individually connected to V
Output mode: Leave open
Leav open
Connected to V
Connected to V
Connected to V
Recommended Connection Method
SS
SS
SS
DD
SS
(can also be left open)
––
––
DD
DD
DD
or V
or V
or V
SS
SS
SS
PD78323, 78324
via resistor
via resistor
via resistor