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
µ
PD789489 Subseries in the test mode before shipment. In
the normal operation mode, directly connect this pin to the VSS pin with as short a wiring length as possible.
If there is a potential difference between the IC0 pin and VSS 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 VSS pin.
V
SS
IC0
Keep short