UPD784020 Datasheet, PDF (15/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCOMPUTER

mPD784020, 784021
6.3 I/O CIRCUITS FOR PINS AND HANDLING OF UNUSED PINS
Table 6-1 describes the types of I/O circuits for pins and the handling of unused pins.
Fig. 6-1 shows the configuration of these various types of I/O circuits.
Table 6-1 Types of I/O Circuits for Pins and Handling of Unused Pins (1/2)
Pin
I/O circuit type
P00-P07
5-A
P10/PWM0
P11/PWM1
P12/ASCK2/SCK2
8-A
P13/RxD2/SI2
5-A
P14/TxD2/SO2
P15-P17
P20/NMI
2
P21/INTP0
P22/INTP1
2-A
P23/INTP2/CI
P24/INTP3
P25/INTP4/ASCK/SCK1 8-A
P26/INTP5
P27/SI0
P30/RxD/SI1
P31/TxD/SO1
P32/SCK0
P33/SO0/SB0
P34/TO0-P37/TO3
AD0-AD7
A8-A15
P60/A16-P63/A19
RD
WR
P66/WAIT/HLDRQ
P67/REFRQ/HLDAK
P70/ANI0-P77/ANI7
2-A
5-A
8-A
10-A
5-A
20
ANO0, ANO1
12
ASTB
4
I/O
Recommended connection method for unused pins
I/O
Input state : To be connected to VDD
Output state: To be left open
Input
To be connected to VDD or VSS
To be connected to VDD
I/O
Input
Input state : To be connected to VDD
Output state: To be left open
To be connected to VDD
I/O
Input state : To be connected to VDD
Output state: To be left open
Output^Note To be left open
I/O
Output
Input state : To be connected to VDD
Output state: To be left open
Input state : To be connected to VDD or VSS
Output state: To be left open
To be left open
Note These pins function as output-only pins depending on the internal circuit, though their I/O type is 5-A.
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