UPD78F9418A NEC, UPD78F9418A Datasheet - Page 41

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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2.3 Pin I/O Circuits and Recommended Connection of Unused Pins
P00 to P03
P20/SCK/ASCK
P21/SO/TxD
P22/SI/RxD
P23/CMPTOUT0/TO2
P24/INTP0/TI0
P25/INTP1/TI1
P26/INTP2/TO5
P27/INTP3/CPT5
P40/KR0 to P45/KR5
P46, P47
P50 to P53 (Mask ROM
version)
P50 to P53 ( µ PD78F9418A)
P60/ANI0/CMPIN0
P61/ANI1/CMPREF0
P62/ANI2 to P66/ANI6
P80/S27 to P87/S20
P90/S19 to P93/S16
S0 to S15
COM0 to COM3
V
BIAS
AV
AV
AV
XT1
XT2
RESET
IC (Mask ROM version)
V
LC0
PP
DD
REF
SS
The I/O circuit type of each pin and recommended connection of unused pins are shown in Table 2-1.
For the I/O circuit configuration of each type, see Figure 2-1.
( µ PD78F9418A)
to V
LC2
Pin Name
I/O Circuit
Type
13-U
10-B
13-T
17-F
17-B
18-A
5-H
8-C
8-C
5-H
9-D
9-C
−
2
−
Table 2-1. Types of Pin I/O Circuits
CHAPTER 2 PIN FUNCTIONS
Output
User’s Manual U13952EJ3V0UD
Input
Input
Input
•−•
•−•
I/O
I/O
I/O
−
Input: Independently connect to V
Output: Leave open.
Input: Independently connect to V
Output: Leave open.
Input: Independently connect to V
Output: Leave open.
Input: Independently connect to V
Output: Leave open.
Connect directly to V
Input: Independently connect to V
Output: Leave open.
Leave open.
Leave open. However, independently connect to V
when none of V
Connect directly to V
Connect directly to V
Connect directly to V
Connect directly to V
Leave open.
Connect directly to V
Independently connect to a 10 kΩ pull-down resistor or connect
directly to V
SS0
Recommended Connection of Unused Pins
LC0
or V
to V
SS1
DD0
DD0
DD0
SS0
SS0
SS0
LC2
.
or V
, V
, V
or V
or V
or V
are used.
DD1
DD1
DD1
, V
, V
SS1
SS1
SS1
.
SS0
SS0
.
.
.
DD0
SS0
DD0
DD0
DD0
, or V
, or V
−
, V
, V
, V
or V
or V
DD1
DD1
DD1
SS1
SS1
SS1
DD1
, V
, V
, V
.
.
via a resistor.
via a resistor.
SS0
SS0
SS0
, or V
, or V
, or V
SS0
or V
SS1
SS1
SS1
via a resistor.
via a resistor.
via a resistor.
SS1
via a resistor
41