21 ic0 (mask rom version only) – NEC PD78F9488 User Manual
Page 44
CHAPTER 2 PIN FUNCTIONS
User’s Manual U15331EJ4V1UD
44
2.2.21 IC0 (mask ROM version only)
The IC0 (Internally Connected) pin is used to set the
µPD789489 Subseries in the test mode before shipment. In
the normal operation mode, directly connect this pin to the V
SS
pin with as short a wiring length as possible.
If there is a potential difference between the IC0 pin and V
SS
pin due to a long wiring length or external noise
superimposed on the IC0 pin, the user program may not run correctly.
• Directly connect the IC0 pin to the V
SS
pin.
V
SS
IC0
Keep short