參數(shù)資料
型號(hào): μPD75P3018A
廠商: NEC Corp.
英文描述: 4 Bit Single Chip Microcontrollers(4位單片微控制器)
中文描述: 4位單片微控制器(4位單片微控制器)
文件頁(yè)數(shù): 31/60頁(yè)
文件大?。?/td> 337K
代理商: ΜPD75P3018A
μPD75P3018A
31
8.2 Program Memory Write Procedure
Program memory can be written at high speed using the following procedure.
(1)
Pull unused pins to Vss through resistors. Set the X1 pin low.
(2)
Supply 5 V to the V
DD
and V
PP
pins.
(3)
Wait 10
m
s.
(4)
Select the zero-clear program memory address mode.
(5)
Supply 6 V to the V
DD
and 12.5 V to the V
PP
pins.
(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
DD
and V
PP
pins back to 5 V.
(13) Turn off the power.
The following figure shows steps (2) to (9).
V
PP
V
DD
V
DD
+ 1
V
DD
V
DD
V
PP
X1
D0/P40 to D3/P43
D4/P50 to D7/P53
MD0/P30
MD1/P31
MD2/P32
MD3/P33
X repetitions
Write
Verify
Additional
write
Address
increment
Data input
Data
output
Data input
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