UPD75P3036 NEC, UPD75P3036 Datasheet - Page 31

• Manufacturer Part Number: UPD75P3036
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

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8.2 Program Memory Write Procedure
Program memory can be written at high speed using the following procedure.
D0/P40-D3/P43
D4/P50-D7/P53
(1) Pull unused pins to V
(2) Supply 5 V to the V
(3) Wait 10 s.
(4) Select the zero-clear program memory address mode.
(5) Supply 6 V to the V
(6) Write data in the 1 ms write mode.
(7) Select the verify mode. If the data is correct, go to step (8) and if not, repeat steps (6) and (7).
(8) (X : number of write operations from steps (6) and (7)) x 1 ms additional write.
(9) Apply four pulses to the X1 pin to increment the program memory address by one.
(10) Repeat steps (6) to (9) until the end address is reached.
(11) Select the zero-clear program memory address mode.
(12) Return the V
(13) Turn off the power.
The following figure shows steps (2) to (9).
V
V
MD0/P30
MD1/P31
MD2/P32
MD3/P33
DD
PP
V
DD
V
V
V
+ 1
X1
DD
DD
PP
DD
and V
DD
DD
SS
PP
and V
and 12.5 V to the V
Data input
through resistors. Set the X1 pin low.
pins back to 5 V.
Write
PP
pins.
X repetitions
PP
Verify
pins.
output
Data
Data input
Additional
write
increment
Address
PD75P3036
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