upd17p401 ETC-unknow, upd17p401 Datasheet - Page 20

• Manufacturer Part Number: upd17p401
• Description: One-time Prom Version 4-bit Single Chip Microcontroller With Dedicated On-chip Camera Hardware
• Manufacturer: ETC-unknow

20
3.2
(1) Unused pins are connected to GND with a pull-down resistor. The CLK pin is driven low.
(2) 5 V is supplied to the V
(3) 5 V is supplied to the V
(4) The mode setting pin is set to the program memory address zero-clear mode.
(5) 6 V is supplied to V
(6) Program inhibit mode.
(7) Data is written in 1 ms write mode.
(8) Program inhibit mode.
(9) Verify mode. If write is successful, go to (10), otherwise repeat (7) to (9).
(10) (Number of times written in (7) to (9): X)
(11) Program inhibit mode.
(12) Program memory address is updated (+1) by inputting 4 pulses to the CLK pin.
(13) Steps (7) to (12) are repeated until the last address.
(14) Program memory address zero-clear mode.
(15) V
(16) Power OFF.
V
V
DD
PP
The procedure for writing to program memory is as shown below, allowing high-speed writing.
Steps (2) to (12) of this procedure are shown in the following Figure.
V
D0-D7
PROGRAM MEMORY WRITE PROCEDURE
DD
DD
MD0
MD1
MD2
MD3
GND
GND
V
V
V
/V
+ 1
X
DD
DD
PP
IN
PP
pin voltage is changed to 5 V.
Reset
DD
, 12.5 V to V
DD
PP
pin after a 10 s wait.
pin. The V
Data Input
Write
PP
.
Repeated x times
PP
pin is driven low.
1 ms additional writes.
Verify
Data
Output
Additional
write
Data Input
Address
increment
PD17P401