UPD784020 Datasheet, PDF (16/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCOMPUTER

mPD784020, 784021
Table 6-1 Types of I/O Circuits for Pins and Handling of Unused Pins (2/2)
Pin
RESET
TEST
AVREF1-AVREF3
AVSS
AVDD
I/O circuit type
2
1
—
I/O
Input
Recommended connection method for unused pins
—
To be connected to VSS directly
To be connected to VSS
To be connected to VDD
Caution When the I/O mode of an I/O dual-function pin is unpredictable, connect the pin to VDD through
a resistor of 10 to 100 kilohms (particularly when the voltage of the reset input pin becomes higher
than that of the low level input at power-on or when I/O is switched by software).
Remark Since type numbers are consistent in the 78K series, those numbers are not always serial in each product.
(Some circuits are not included.)
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