參數(shù)資料
型號: UPD784021GC-3B9
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 16/8-BIT單片機(jī)
文件頁數(shù): 15/90頁
文件大?。?/td> 614K
代理商: UPD784021GC-3B9
15
m
PD784020, 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)
Note
These pins function as output-only pins depending on the internal circuit, though their I/O type is 5-A.
Pin
I/O circuit type
I/O
Recommended connection method for unused pins
P00-P07
5-A
I/O
Input state : To be connected to V
DD
P10/PWM0
Output state: To be left open
P11/PWM1
P12/ASCK2/SCK2
8-A
P13/RxD2/SI2
5-A
P14/TxD2/SO2
P15-P17
P20/NMI
2
Input
To be connected to V
DD
or V
SS
P21/INTP0
P22/INTP1
2-A
To be connected to V
DD
P23/INTP2/CI
P24/INTP3
P25/INTP4/ASCK/SCK1
8-A
I/O
Input state : To be connected to V
DD
Output state: To be left open
P26/INTP5
2-A
Input
To be connected to V
DD
P27/SI0
P30/RxD/SI1
5-A
I/O
Input state : To be connected to V
DD
P31/TxD/SO1
Output state: To be left open
P32/SCK0
8-A
P33/SO0/SB0
10-A
P34/TO0-P37/TO3
5-A
AD0-AD7
A8-A15
Output
Note
To be left open
P60/A16-P63/A19
RD
WR
P66/WAIT/HLDRQ
I/O
Input state : To be connected to V
DD
P67/REFRQ/HLDAK
Output state: To be left open
P70/ANI0-P77/ANI7
20
Input state : To be connected to V
DD
or V
SS
Output state: To be left open
ANO0, ANO1
12
Output
To be left open
ASTB
4
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