UPD75P3116 NEC, UPD75P3116 Datasheet - Page 28

• Manufacturer Part Number: UPD75P3116
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

D0/P60 to D3/P63
D4/P50 to D7/P53
8.2 Program Memory Write Procedure
Program memory can be written at high speed using the following procedure.
28
V
(1) Pull down unused pins to Vss through resistors. Set the X1 pin low.
(2) Supply 5 V to the V
(3) Wait 10 s.
(4) Select the program memory address zero-clear mode.
(5) Supply 6 V to V
(6) Write data in the 1-ms write mode.
(7) Select the verify mode. If the data is written, go to (8) and if not, repeat (6) and (7).
(8) Additional write. (X: number of write operations from (6) and (7)) x 1 ms
(9) Apply four pulses to the X1 pin to increment the program memory address by one.
(10) Repeat (6) to (9) until the end address is reached.
(11) Select the program memory address zero-clear mode.
(12) Return the V
(13) Turn off the power.
The following figure shows steps (2) to (9).
V
DD
PP
MD1/P31
MD2/P32
MD3/P33
MD0/P30
V
DD
X1
V
V
V
+ 1
DD
DD
PP
DD
- and V
DD
and 12.5 V to V
DD
and V
PP
-pin voltages to 5 V.
Data input
Write
PP
pins.
X repetitions
PP
pins.
Verify
output
Data
Data input
Additional
write
Address
increment
PD75P3116