參數(shù)資料
型號(hào): μPD75P70076
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)
文件頁數(shù): 30/62頁
文件大小: 290K
代理商: ΜPD75P70076
m
PD75P0076
30
8.2 Steps in Program Memory Write Operation
High-speed program memory write can be executed via the following steps.
(1)
Pull down unused pins to V
SS
via resistors. Set the X1 pin to low.
(2)
Apply +5 V to the V
DD
and V
PP
pins.
(3)
Wait 10
m
s.
(4)
Zero-clear mode for program memory addresses.
(5)
Apply +6 V to V
DD
and +12.5 V to V
PP
.
(6)
Write data using 1-ms write mode.
(7)
Verify mode. If write is verified, go to step (8) and if write is not verified, go back to steps (6) to (7).
(8)
X [= number of write operations from steps (6) to (7)] x 1 ms additional write
(9)
4 pulse inputs to the X1 pin updates (increments +1) the program memory address.
(10) Repeat steps (6) to (9) until the last address is completed.
(11) Zero-clear mode for program memory addresses.
(12) Apply +5 V to the V
DD
and V
PP
pins.
(13) Power supply OFF
The following diagram illustrates steps (2) to (9).
V
PP
V
DD
V
DD
+ 1
V
DD
V
DD
V
PP
X1
D0/P40-D3/P43
D4/P50-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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