21 vdd, 22 vss, 23 vpp (upd78p078y only) – NEC uPD78P078 User Manual
Page 95: 24 ic (mask rom version only)
95
CHAPTER 4 PIN FUNCTION (
µ
PD78078Y SUBSERIES)
4.2.21 V
DD
Positive power supply pin
4.2.22 V
SS
Ground potential pin
4.2.23 V
PP
(
µ
PD78P078Y only)
High-voltage apply pin for PROM programming mode setting and program write/verify. Connect directly to V
SS
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
µ
PD78078Y at delivery. Connect
it directly to the V
SS
with the shortest possible wire in the normal operating mode.
When a voltage difference is produced between the IC pin and V
SS
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
SS
pins directly.
V
SS
IC
As short as possible