CHAPTER 2 PIN FUNCTIONS
User’s Manual U18172EJ2V0UD
24
2.3 Pin I/O Circuits and Connection of Unused Pins
Table 2-1 shows I/O circuit type of each pin and the connections of unused pins.
For the configuration of the I/O circuit of each type, refer to
Figure 2-1
.
Table 2-1. Types of Pin I/O Circuits and Connection of Unused Pins
Pin Name
I/O Circuit Type
I/O
Recommended Connection of Unused Pin
P20/ANI0/TI000/TOH1
P21/ANI1/TI010/TO00/
INTP0
11
Input: Individually connect to V
DD
or V
SS
via resistor.
Output: Leave open.
P22/ANI2/X2
P23/ANI3/X1
36
Input: Individually connect to V
SS
via resistor.
Output: Leave open.
P32/INTP1 8-A
I/O
Input: Individually connect to V
DD
or V
SS
via resistor.
Output: Leave open.
P34/RESET
2
Input
Connect to V
DD
via resistor.
P40 and P43
8-A
I/O
Input: Individually connect to V
DD
or V
SS
via resistor.
Output: Leave open.