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): 32/60頁(yè)
文件大?。?/td> 337K
代理商: ΜPD75P3018A
μPD75P3018A
32
8.3 Program Memory Read Procedure
The
m
PD75P3018A can read program memory contents 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)
Select the verify mode. Apply four pulses to the X1 pin. Every four clock pulses will output the data stored in one
address.
(7)
Select the zero-clear program memory address mode.
(8)
Return the V
DD
and V
PP
pins back to 5 V.
(9)
Turn off the power.
The following figure shows steps (2) to (7).
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
MD2/P32
MD3/P33
MD1/P31
“L”
Data output
Data output
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