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參數(shù)資料
| 型號： | 6P8B |
| 廠商： | NEC Corp. |
| 英文描述： | MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 馬鞍山集成電路4位單片機的紅外遙控傳輸 |
| 文件頁數(shù)： | 61/95頁 |
| 文件大?。?/td> | 692K |
| 代理商： | 6P8B |
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61
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
12.WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY) (
μ
PD6P8)
The program memory of the
μ
PD6P8 is a one-time PROM of 2026
×
10 bits.
To write or verify this one-time PROM, the pins shown in Table 5-1 are used. Note that no address input pin
is used. Instead, the address is updated by using the clock input from the CLK pin.
Table 12-1. Pins Used to Write/Verify Program Memory
Pin Name
Function
V
PP
Supplies voltage when writing/verifying program memory.
Apply +10.5 V to this pin.
V
DD
Power supply.
Supply +3 V to this pin when writing/verifying program memory.
CLK
Inputs clock to update address when writing/verifying program memory.
By inputting a pulse four times to the CLK pin, the address of the program memory is updated.
MD
0
to MD
3
Input to select the operation mode when writing/verifying program memory.
D
0
to D
7
Inputs/outputs 8-bit data when writing/verifying program memory.
X
IN
, X
OUT
Clock necessary for writing program memory. Connect a 4 MHz ceramic resonator to this pin.
12.1 Operating Mode When Writing/Verifying Program Memory
The
μ
PD6P8 is set in the program memory write/verify mode when +10.5 V is applied to the V
PP
pin after the
μ
PD6P8 has been in the reset status (V
DD
= 3 V, V
PP
= 0 V) for a specific time. In this mode, the operating modes
shown in Table 5-2 can be set by setting the MD
0
through MD
3
pins. Connect all the pins other than those shown
in Table 5-1 to GND via pull-down resistors.
Table 12-2. Setting Operating Mode
Setting of Operating Mode
Operating Mode
V
PP
V
DD
MD
0
MD
1
MD
2
MD
3
+10.5 V
+3 V
H
L
H
L
Clear program memory address to 0
L
H
H
H
Write mode
L
L
H
H
Verify mode
H
×
H
H
Program inhibit mode
×
: don’t care (L or H)
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