Ic (Mask Rom Version Only) - NEC mPD178054 Series User Manual

2.2.25 IC (Mask ROM version only)

The IC (Internally Connected) pin is provided to set the test mode to check the µ PD178054 Subseries at delivery.
Connect it directly to the GND pin with the shortest possible wire in the normal operating mode.
When a potential difference is produced between the IC pin and GND pin because the wiring between those two
pins is too long or an external noise is input to the IC pin, the user's program may not run normally.
34
CHAPTER 2 PIN FUNCTION
Connect IC pin to GND pin directly.
GND IC
As short as possible
User's Manual U15104EJ2V0UD