NEC PD78076Y User Manual

CHAPTER 4 PIN FUNCTION (

PD78078Y SUBSERIES)

4.2.21 V

Positive power supply pin

4.2.22 V

Ground potential pin

4.2.23 V

(

PD78P078Y only)

High-voltage apply pin for PROM programming mode setting and program write/verify. Connect directly to V

in normal operating mode.

4.2.24 IC (Mask ROM version only)

The IC (Internally Connected) pin is provided to set the test mode to check the

PD78078Y at delivery. Connect

it directly to the V

with the shortest possible wire in the normal operating mode.

When a voltage difference is produced between the IC pin and V

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.

•

Connect IC pins to V

pins directly.

As short as possible