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CHAPTER 2 PIN FUNCTIONS
User’s Manual U15798EJ2V0UD
2.3 Pin I/O Circuits and Recommended Connection of Unused Pins
Table 2-1 shows the types of pin I/O circuit and the recommended connections of unused pins.
Refer to Figure 2-1 for the configuration of the I/O circuit of each type.
Table 2-1. Pin I/O Circuit Types (1/2)
Pin Name
I/O Circuit
I/O
Recommended Connection of Unused Pins
Type
P00/INTP0 to P02/INTP2
8-C
I/O
Input:
Independently connect to V
SS0
or V
SS1
via a resistor.
P03/INTP3/ADTRG
Output: Leave open.
P04/INTP4
P05/INTP5/PCL
P06/INTP6/TOB0
P07/TOA0/TMIB0
P10/ANI0 to P17/ANI7
25
Input
Directly connect to V
DD0
or V
SS0
.
P20/SI3
8-C
I/O
Input:
Independently connect to V
DD0
, V
DD1
, V
SS0
or V
SS1
via
P21/SO3
5-H
a resistor.
P22/SCK3
8-C
Output: Leave open.
P23/SI1
P24/SO1
5-H
P25/SCK1
8-C
P26/RxD0
P27/TxD0
5-H
P30, P31
µ
PD780343,
13-S
Input:
Directly connect to V
SS0
or V
SS1
.
780344, 780353,
Output: Leave open at low level.
780354 only
µ
PD78F0354 only
13-R
P30/SCL0
µ
PD780344Y,
P31/SDA0
780354Y
Subseries only
P32/TI51/TO51
8-C
Input:
Independently connect to V
DD0
, V
DD1
, V
SS0
, or V
SS1
via
P33/TO50/TI50
a resistor.
P34/TI01/TO00
Output: Leave open.
P35/TI00
P40 to P43
5-H
P70 to P73 Mask ROM version 13-Q
Input:
Directly connect to V
SS0
or V
SS1
.
Flash memory
13-P
Output: Leave open at low level.
version
P80/S12 to P87/S19
17-G
Input:
Independently connect to V
DD0
, V
DD1
, V
SS0
, or V
SS1
via
P90/S20 to P97/S27
a resistor.
P100/S28 to P107/S35
Output: Leave open.
P110/S36 to P113/S39
S0 to S11
17-D
Output
Leave open.