參數(shù)資料
型號: μPD78P9014
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 22/48頁
文件大?。?/td> 191K
代理商: ΜPD78P9014
μ
PD78P9014
22
7.3 PROM reading procedure
The following is the PROM reading procedure.
(1)
(2)
(3)
(4)
(5)
(6)
Pull down each unused pin through the resistor to V
SS
. The X1 pin has the low level.
Supply +5 V to the V
DD
and V
PP
pins.
Wait 10
μ
s.
0 clear mode in the program memory address
Supply +5.5V to V
DD
and +12.5 V to V
PP
.
Verify mode. When clock pulses are input to the X1 pin, the data are sequentially output for each address for
a period of four clock pulses.
0 clear mode in the program memory address
Supply +5 V to the V
DD
and V
PP
pins.
Power off
(7)
(8)
(9)
Steps (2) to (7) are shown in the figure below.
"L"
V
DD
V
DD
V
PP
D0-D7
X1
MD0
MD1
MD2
MD3
V
DD
+ 0.5
V
DD
V
PP
Data output
Data output
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