UPD78P324 Datasheet, PDF (18/80 Pages) NEC – 16-/8-Bit Single-Chip Microcomputers

µPD78P324, 78P324(A)
Function
Address input
Data input
Program pulse
Chip enable
Output enable
Program voltage
Mode voltage
Table 3-1. Pin Functions in Programming Mode
Normal Operation Mode
P00-P07, P80, P20, P81-P85, P33, P34
P40-P47
P32
P31
P30
VPP
RESET, AVDD
Programming Mode
A0-A16
D0-D07
PGM
CE
OE
3.1 OPERATION MODE
When placing the microcomputer in programming Write/Verify mode, set it to RESET = H and AVDD = L.
In this mode, an operation mode in Table 3-2 can be selected by further setting the CE and OE pins.
When reading the content of the PROM, set it to Read mode. Process the unused pins in accordance with
the instructions in the PIN CONFIGURATION.
Table 3-2. Operation Mode of PROM Programming
Mode
RESET
AVDD
CE
Program Write
L
Program verify
L
Program inhibit
X
H
L
X
Read
L
Output disable
L
Standby
H
OE
PGM
VPP
VDD
D0-D7
H
L
Data input
L
H
Data output
+12.5 V +6.5 V
L
L
H
H
High impedance
L
H
Data output
H
X
+5 V
+5 V High impedance
X
X
High impedance
Remark x: L or H
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