X1 And X2; Xt1 And Xt2; Vdd; Vss - NEC PD78052 User Manual

4.2.16 X1 and X2

Crystal resonator connect pins for main system clock oscillation. For external clock supply, input it to X1 and its
inverted signal to X2.

4.2.17 XT1 and XT2

Crystal resonator connect pins for subsystem clock oscillation.
For external clock supply, input it to XT1 and its inverted signal to XT2.
4.2.18 V
DD
Positive power supply pin
4.2.19 V
SS
Ground potential pin
4.2.20 V (PROM versions only)
PP
High-voltage apply pin for PROM programming mode setting and program write/verify. Directly connect to V
in the normal operating mode.

4.2.21 IC (Mask ROM version only)

The IC (Internally Connected) pin is provided to set the test mode to check the PD78054Y Subseries before
shipment. Directly connect the pin to the V
When a voltage difference is produced between the IC pin and V
is too long or an external noise is input to the IC pin, the user's program may not run normally.
86
CHAPTER 4 PIN FUNCTION ( PD78054Y Subseries)
with the shortest possible wire in the normal operating mode.
SS
Directly connect IC pins to V
V
SS
pin because the wiring between those two pins
SS
pins.
SS
IC
As short as possible
SS