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2.3 Pin Input/Output Circuits and Recommended Connection of Unused Pins
The input/output circuit type of each pin and recommended connection of unused pins are shown in Table 2-1.
For the input/output circuit configuration of each type, see Figure 2-1.
Pin Name
P00/KR0 to P03/KR3
P10, P11
P20
P21/BZO90
P22/SS20
P23/SCK20/ASCK20
P24/SO20/TxD20
P25/SI20/RxD20
P26/TO90
P30/INPT0/CPT90
P31/INPT1/TO50/TMI60
P32/INPT2/TO60
P33/INPT3/TO61
P50 to P53
(Mask ROM version)
P50 to P53
(Flash memory version)
P60/ANI0 to P65/ANI5
P70 to P72
Note 1
P80, P81
Note 1
P90 to P97
Note 1
S0 to S4
Note 2
S0 to S14
COM0 to COM3
V
to V
LC0
LC2
CAPH, CAPL
XT1
XT2
AV
SS
AV
DD
RESET
IC
V
PP
Notes 1. When using the
2. When using the
44
CHAPTER 2 PIN FUNCTIONS
Table 2-1. Types of Pin Input/Output Circuits
I/O Circuit
I/O
Type
8-A
I/O
Input:
Output: Leave open.
5-A
8-A
Input:
Output: Leave open.
13-W
Input:
Output: Leave this pin open at low-level output after clearing the output
13-V
9-C
Input
Connect directly to V
5-A
I/O
Input:
Output: Leave open.
17
Output
Leave open.
•−•
18
−
Input
Connect directly to V
−
Leave open.
Connect directly to V
Connect directly to V
2
Input
−
•−•
Connect directly to V
Independently connect a 10 kΩ pull-down resistor, or connect directly
to V
µ
PD789426 and 789436 Subseries
µ
PD789446 and 789456 Subseries
User's Manual U15075EJ2V1UD
Recommended Connection of Unused Pins
Independently connect to V
Independently connect to V
Connect directly to V
.
SS
latch of the port to 0.
or V
.
DD
SS
Independently connect to V
.
SS
.
SS
.
DD
.
SS
.
SS
or V
via a resistor.
DD
SS
via a resistor.
SS
or V
via a resistor.
DD
SS
−
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