CHAPTER 2 PIN FUNCTIONS
User’s Manual U12697EJ3V0UM
53
2.3 Pin I/O 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, refer to Figure 2-1.
Table 2-1. Types of Pin I/O Circuits and Recommended Connection of Unused Pins (1/2)
Pin Name
I/O Circuit Type
I/O
Recommended Connection of Unused Pins
P00/INTP0
8-K
I/O
Input:
Independently connect to V
SS0
via a resistor.
P01/INTP1
Output: Leave open.
P02/INTP2/NMI
P03/INTP3 to P05/INTP5
P10/ANI0 to P17/ANI7
9
Input
Connect to V
SS0
or V
DD0
.
P20/RxD1/SI1
10-I
I/O
Input:
Independently connect to V
SS0
via a resistor.
P21/TxD1/SO1
10-J
Output: Leave open.
P22/ASCK1/SCK1
10-I
P23/PCL
10-J
P24/BUZ
P25/SDA0
Note
/SI0
10-I
P26/SO0
10-J
P27/SCL0
Note
/SCK0
10-I
P30/TO0 to P32/TO2
8-M
P33/TI1, P34/TI2
8-K
P35/TI00, P36/TI01
8-L
P37/EXA
8-M
P40/AD0 to P47/AD7
5-H
P50/A8 to P57/A15
P60/A16 to P63/A19
P64/RD
P65/WR
P66/WAIT
P67/ASTB
P70/RxD2/SI2
8-K
P71/TxD2/SO2
8-L
P72/ASCK2/SCK2
8-K
Note
The SDA0 and SCL0 pins are provided only for the
µ
PD784225Y Subseries.