UPD784938 Datasheet, PDF (63/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 2 PIN FUNCTIONS
Table 2-5. Pin Input/Output Circuit Types and Recommended Connection of Unused Pins (2/2)
Pin Name
P70/ANI0 to P77/ANI7
P90 to P97
P100 to P104
P105/SCK3
P106/SI3
P107/SO3
ASTB/CLKOUT
RESET
IC/VPP^Note
XT2
XT1
REGOFF
REGC
PWM0, PWM1
RX
TX
AVREF1
AVSS
AVDD
Input/Output
Circuit Type
20
5-A
10-A
8-A
10-A
4
2
1
—
—
1
—
3
2
3
—
Input/Output
Input/output
Recommended Connection
of Unused Pins
Input: Connect to VDD or VSS
Output: Leave open
Output
Input
—
Input
—
Output
Input
Output
Input
Leave open
—
Directly connect to VSS
Leave open
Connect to VSS
Connect to VDD
Leave open
Connect to VDD or VSS
Leave open
Connect to VSS
Connect to VDD
Note The VPP pin is used only in the µPD78F4938.
Caution If the input/output mode is undefined for an input/output alternate-function pin, it should be connected
to VDD via a resistor of several tens of kΩ (especially when the reset input pin goes to the low-level input
voltage or over upon powering on, and when input/output is switched by software.)
Remark The type numbers are standard for the 78K Series, and therefore are not necessarily serial numbers within each
product (there are non-incorporated circuits).
Preliminary User’s Manual U13987EJ1V0UM00
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