參數(shù)資料
型號: UPD75P108B
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機
文件頁數(shù): 16/46頁
文件大?。?/td> 381K
代理商: UPD75P108B
16
μ
PD75P108B
4.3
PROGRAM MEMORY READ PROCEDURE
The
μ
PD75P108B can read the content of the program memory in the following procedure.
Pull down a pin which is not used to V
SS
via the resistor. A low-level signal is input to the X1 pin.
Supply +5 V to the V
DD
and V
PP
pins.
10
μ
s wait.
The program memory address 0 clear mode.
Supply +6 V and +12.5 V respectively to V
DD
and V
PP
.
The program inhibit mode.
The verify mode. If clock pulses are input to the X1 pin, data is output sequentially 1 address at a time at
the period of inputting 4 pulses.
The program inhibit mode.
The program memory address 0 clear mode.
(10) Change the V
DD
and V
PP
pins voltage to +5 V.
(11) Power off.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
The diagram below shows the procedure of the above (2) to (9).
Data Output
Data Output
V
PP
V
PP
V
DD
V
DD
V
DD
+ 1
V
DD
X1
P40-P43
P50-P53
MD0
MD1
MD2
MD3
"L"
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