UPD78F9418A NEC, UPD78F9418A Datasheet - Page 39

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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2.2.14 AV
when the A/D converter is not used).
2.2.15 RESET
2.2.16 X1, X2
2.2.17 XT1, XT2
2.2.18 V
2.2.19 V
2.2.20 V
program is written or verified.
the user program may not run correctly.
This pin is the A/D converter ground potential pin. Always keep it at the same potential as the V
This pin inputs an active-low system reset signal.
These pins are used to connect a crystal resonator for main system clock oscillation.
To supply an external clock, input the clock to X1 and input the inverted signal to X2.
These pins are used to connect a crystal resonator for subsystem clock oscillation.
To supply an external clock, input the clock to XT1 and input the inverted signal to XT2.
V
V
A high voltage should be applied to this pin when the flash memory programming mode is set and when the
Handle the pins in either of the following ways.
• Independently connect a 10 kΩ pull-down resistor.
• Switch this pin to be directly connected to the dedicated flash programmer in programming mode or to V
If the wiring between the V
DD0
SS0
V
SS1
is the ground potential pin for ports, while the V
is the positive power supply pin for ports, while V
DD0
SS0
PP
SS
in normal operation mode using a jumper on the board.
( µ µ µ µ PD78F9418A only)
, V
, V
SS1
DD1
PP
pin and V
SS0
CHAPTER 2 PIN FUNCTIONS
User’s Manual U13952EJ3V0UD
or V
SS1
pin is long, or external noise is superimposed on the V
SS1
DD1
is the ground potential pin for other than ports.
is the positive power supply pin for other than ports.
SS0
pin (even
PP
SS0
pin,
39
or