UPD78P324 Datasheet, PDF (13/80 Pages) NEC – 16-/8-Bit Single-Chip Microcomputers

µPD78P324, 78P324(A)
(2) Pins other than ports (2/2)
Pin Name
ASTB
WDTO
EA
AN0-AN7
AVREF
AVDD
AVSS
RESET
X1
X2
VDD
VSS
NC
I/O
Output
Output
Input
Input
Input
—
—
Input
Input
—
—
—
—
Function
Access to external memory. Timing signal output for
externally latching the lower address which is output
from the AD0-AD7 pin.
Output of the signal which indicates that the watchdog
timer generated a non-maskable interrupt.
Normally, the EA pin is connected to VDD. By connecting
the EA pin to Vss, the system is placed in ROM-less mode
to access external memory. The level of the EA pin
cannot be switched over during operation.
Analog input to the A/D converter
Reference voltage input of the A/D converter.
Analog power of the A/D converter.
Ground of the A/D converter.
Input of the system reset.
Connection of the crystal oscillator for system clock
generation. When clocks are supplied externally, they are
input to the X1 pin and their reverse signals are input to
the X2 pin. (The X2 pin can also be left unconnected.)
Positive power voltage.
Ground.
Internally unconnected. Please connect this to Vss. (It can
also be left unconnected.)
Shared Pin Name
—
—
—
P70-P77
—
—
—
—
—
—
—
—
—
1.2 PROM PROGRAMMING MODE (RESET = H, AVDD = L)
Pin Name
AVDD
RESET
A0-A16
D0-D7
PGM
CE
OE
VPP
VDD
VSS
NC
I/O
Input
Input
I/O
Input
Input
Input
—
Function
PROM programming mode setting
Address bus
Data bus
Program input
PROM enable input
Read strobe to PROM
Write power
Positive power voltage
Ground
Internally unconnected. Please connect this to VSS. (It can also be left uncon-
nected.)
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