參數(shù)資料
型號(hào)： UPD6P5
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述： 4位單片機(jī)的紅外遙控傳輸
文件頁(yè)數(shù)： 12/32頁(yè)
文件大小： 232K
代理商： UPD6P5
12
μ
PD6P5
Data Sheet U14760EJ1V0DS00
3. WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY)
The program memory of the
μ
PD6P5 is a one-time PROM of 2,026
×
10 bits.
To write or verify this program memory, the pins shown in Table 3-1 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 3-1. Pins Used to Write/Verify Program Memory
Pin Name
Function
V
PP
Supplies voltage when writing/verifying program memory.
Apply +12.5 V to this pin.
V
DD
Power supply.
Supply +6 V to this pin when writing/verifying program memory.
CLK
Inputs clock to update address when writing/verifying program memory.
By inputting pulse four times to CLK pin, address of program memory is updated.
MD
0
-MD
3
Input to select operation mode when writing/verifying program memory.
D
0
-D
7
Inputs/outputs 8-bit data when writing/verifying program memory.
X
IN
, X
OUT
Clock necessary for writing program memory. Connect 4-MHz ceramic resonator to this pin.
3.1 Operation Mode When Writing/Verifying Program Memory
The
μ
PD6P5 is set in the program memory write/verify mode when +6 V is applied to the V
DD
pin and +12.5 V
is applied to the V
PP
pin after the
μ
PD6P5 has been in the reset status (V
DD
= 5 V, V
PP
= 0 V) for a specific time.
In this mode, the operation modes shown in Table 3-2 can be set by setting the MD
0
through MD
3
pins. Connect
all the pins other than those shown in Table 3-1 to GND via pull-down resistor.
Table 3-2. Setting Operation Mode
Setting of Operation Mode
Operation Mode
V
PP
V
DD
MD
0
MD
1
MD
2
MD
3
+12.5 V
+6 V
H
L
H
L
Clear program 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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