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CHAPTER 2 PIN FUNCTION
User’s Manual U15104EJ2V0UD
2.3 Pin I/O Circuits and Recommended Connections of Unused Pins
Table 2-1 shows the types of the I/O circuits of the respective pins and the recommended connections of the pins
when they are not used. For the configuration of the I/O circuit of each pin, refer to Figure 2-1.
Table 2-1. Pin I/O Circuit Type and Recommended Connections of Unused Pins
Pin Name
I/O Circuit Type
I/O
Recommended Connection of Unused Pin
P00/INTP0 to P04/INTP4
8
I/O
Input: Connect to V
DD
, V
DD
PORT, GND, or GNDPORT via a resistor.
P05, P06
Output: Leave open.
P10/ANI0 to P15/ANI5
25
Input
Connect to V
DD
, V
DD
PORT, GND, or GNDPORT.
P30 to P32
5
I/O
Input: Connect to V
DD
, V
DD
PORT, GND, or GNDPORT via a resistor.
P33/TI50
5-K
Output: Leave open.
P34/TI51
P35
5
P36/BEEP0
P37/BUZ
P40 to P47
5-A
P50 to P57
5
P60 to P67
P70/SI30
5-K
P71/SO30
5
P72/SCK30
5-K
P73
5
P74/SI31
5-K
P75/SO31
5
P76/SCK31
5-K
P77/TI52
P120/SI32
P121/SO32
5
P122/SCK32
5-K
P123/SI321
P124/SO321
5
P125/SCK321
5-K
P130/TO50
19
Output
Leave open.
P131/TO51
P132/TO52
EO0, EO1
DTS-EO1
VCOL, VCOH
DTS-AMP
Input
Disable PLL in software and select pull-down.
AMIFC, FMIFC
Set these pins in general-purpose input port mode by software and connect
each of them to V
DD
, V
DD
PORT, GND, or GNDPORT via a resistor.
REGOSC, REGCPU
–
–
Connect these pins to GND via 0.1
µ
F capacitor.
RESET
2
Input
–
V
DD
PLL
–
–
Connect to V
DD
.
GNDPLL
Directly connect to GND or GNDPORT.
IC (Mask ROM version)
V
PP
(
µ
PD178F054)