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2.3 Pin I/O Circuits and Recommended Connection of Unused Pins
Table 2-1 shows the I/O circuit types of pins 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/INTP0/TI0
P01/INTP1
P02/INTP2
P03/INTP3
P04/XT1
P10/ANI0 to P17/ANI7
P20/SI1
P21/SO1
P22/SCK1
P23/STB
P24/BUSY
P25/SI0/SB0
P26/SO0/SB1
P27/SCK0
Mask ROM version
P30/TO0
P31/TO1
P32/TO2
P33/TI1
P34/TI2
P35/PCL
P36/BUZ
P37
Note
Leave open when an on-chip pull-down resistor is specified by the mask option.
CHAPTER 2 PIN FUNCTIONS
Table 2-1. Types of Pin I/O Circuits (1/2)
I/O
I/O
Circuit Type
2
Input
8-A
I/O
16
Input
11
I/O
8-A
5-A
8-A
5-A
8-A
10-A
5-C
I/O
8-B
5-C
User's Manual U11302EJ4V0UM
Recommended Connection of Unused Pins
Connect to V
.
SS
Input: Independently connect to V
Output: Leave open.
Connect to V
or V
.
DD
SS
Input: Independently connect to V
Output: Leave open.
Input: Independently connect to V
Output: Leave open.
via a resistor.
SS
or V
via a resistor.
DD
SS
Note
or V
via a resistor
.
DD
SS
43
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