NEC 78K0 Series User Manual page 44

Pin Name
Note 1
P121/X1 37
Note 1
P122/X2/EXCLK
Note 1
P123/XT1
Note 1
P124/XT2/EXCLKS
P130 3-C
P140/PCL/INTP6 5-AH
P141/BUZ/INTP7
RESET 2
FLMD0 38
AV
REF
AV
SS
Notes 1. Use recommended connection above in I/O port mode (see Figure 6-2 Format of Clock Operation
Mode Select Register (OSCCTL)) when these pins are not used.
2. Make the same potential as the V
44
CHAPTER 2 PIN FUNCTIONS
Table 2-2. Pin I/O Circuit Types (2/2)
I/O Circuit Type I/O
I/O
Output
I/O
Input
Input
− −
pin when port 2 is used as a digital port.
DD
Preliminary User's Manual U17260EJ3V1UD
Recommended Connection of Unused Pins
Input: Independently connect to EV
Output: Leave open.
Leave open.
Input: Independently connect to EV
Output: Leave open.
Connect to EV or V .
SS SS
Connect directly to EV or V
DD DD
Connect directly to EV or V
SS SS
or EV via a resistor.
DD SS
or EV via a resistor.
DD SS
−
Note 2
.
.