Pin I/O Circuits And Recommended Connection Of Unused Pins - NEC 78K0 User Manual

2.3 Pin I/O Circuits and Recommended Connection of Unused Pins

Table 2-2 shows the types of pin I/O circuits and the recommended connections of unused pins.
Refer to Figure 2-1 for the configuration of the I/O circuit of each type.
Pin Name
P00/TI000
P01/TI010/TO00
P12/SO10
P13/TxD6
P14/RxD6
P15/TOH0
P16/TOH1/INTP5
P17/TI50/TO50
P20/ANI0 to P27/ANI7
P30/INTP1 to P32/INTP3
P33/TI51/TO51/INTP4
P60, P61 (Mask ROM version)
P60, P61 (Flash memory version)
P62, P63 (Mask ROM version)
P62, P63 (Flash memory version)
P70/KR0 to P73/KR3
P120/INTP0
P130
RESET
XT1
XT2
AV
REF
AV
SS
IC
V
PP
Note Connect port 2 directly to EV
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CHAPTER 2 PIN FUNCTIONS
Table 2-2. Pin I/O Circuit Types
I/O Circuit Type I/O
8-A I/O
5-A
8-A
5-A
8-A
9-C Input
8-A I/O
13-S
13-R
13-V
13-W
8-A
3-C Output
2 Input
16
−
−
when it is used as a digital port.
DD
User's Manual U16227EJ2V0UD
Recommended Connection of Unused Pins
Input: Independently connect to EV
Output: Leave open.
Connect to EV or EV .
DD SS
Input: Independently connect to EV
Output: Leave open.
Input: Connect to EV .
SS
Output: Leave this pin open at low-level output after clearing
the output latch of the port to 0.
Input: Independently connect to EV
Output: Leave open.
Leave open.
Connect directly to EV or V
DD DD
Leave open.
Connect directly to EV or V
DD DD
Connect directly to EV or V
SS SS
Connect to EV or V .
SS SS
or EV via a resistor.
DD SS
or EV via a resistor.
DD SS
or EV via a resistor.
DD SS
−
.
Note
.
.