CHAPTER 2 PIN FUNCTIONS
Preliminary User’s Manual U16315EJ1V0UD
42
2.2.12 RESET
This is the active-low system reset input pin.
2.2.13 REGC
This is the pin for connecting the capacitor for the regulator. Connect this pin to V
SS
via a 0.1
µ
F capacitor. To use
the CPU at high speed (f
XP
= 10 MHz, V
DD
= 4.0 to 5.5 V), connect this pin directly to V
DD
and apply the same potential
to it as the V
DD
pin.
2.2.14 X1 and X2
These are the pins for connecting a crystal resonator for X1 input clock oscillation.
When supplying an external clock, input a signal to the X1 pin and input the inverse signal to the X2 pin.
2.2.15 XT1 and XT2
These are the pins for connecting a crystal resonator for subsystem clock oscillation.
When supplying an external clock, input a signal to the XT1 pin and input the inverse signal to the XT2 pin.
2.2.16 V
DD
and EV
DD
V
DD
is the positive power supply pin for other than ports.
EV
DD
is the positive power supply pin for ports.
2.2.17 V
SS
and EV
SS
V
SS
is the ground potential pin for other than ports.
EV
SS
is the ground potential pin for ports.
2.2.18 V
PP
(flash memory versions only)
This is a pin for flash memory programming mode setting and high-voltage application for program write/verify.
Connect directly to EV
SS
or V
SS
in the normal operation mode.
2.2.19 IC (mask ROM versions only)
The IC (Internally Connected) pin is provided to set the test mode to check the 78K0/KD1 Series at shipment.
Connect it directly to EV
SS
or V
SS
pin with the shortest possible wire in the normal operation mode.
When a potential difference is produced between the IC pin and the EV
SS
or V
SS
pin because the wiring between
these two pins is too long or external noise is input to the IC pin, the user’s program may not operate normally.
• Connect the IC pin directly to EV
SS
or V
SS
pin.
As short as possible
IC
EV
SS
or V
SS
Содержание 78K0/KD1 Series
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