參數(shù)資料
型號(hào)： 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(jī)微控制器（8位單片微控制器）
文件頁(yè)數(shù)： 21/48頁(yè)
文件大小： 191K
代理商： ΜPD78P9014
μ
PD78P9014
21
7.2 PROM writing procedure
The following is the PROM writing procedure. High-speed writing is enabled.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10) Repeat (6) to (9) until the last address.
(11) 0 clear mode of the program memory address
(12) Change the voltages at the V
DD
and V
PP
pins to 5 V.
(13) Power off
Pull down each unused pin through a 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 5.5 V to the V
DD
pin and 12.5 V to the V
PP
pin.
Write data in the 1-ms write mode.
Verify mode. If written, go to (8). If not written, repeat (6) and (7).
Additional write for (Counts written in (6) and (7): X)
×
1 ms
Update (+1) the program memory address by the input of four pulses at the X1 pin.
Steps (2) to (9) are illustrated in the following diagram.
V
DD
V
DD
V
PP
D0-D7
X1
MD0
MD1
MD2
MD3
V
DD
+ 0.5
V
PP
V
DD
Repeat X times
Write
Verify
Additional write
Increment
address
Data input
Data
output
Data input
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