參數(shù)資料
型號(hào)： UPD61P24GS
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION
中文描述： 4位單片機(jī)的遙控傳輸
文件頁(yè)數(shù)： 18/36頁(yè)
文件大?。?/td> 252K
代理商： UPD61P24GS
μ
PD61P24
18
17. WRITING, READING, AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY)
To write, read, or verify the PROM, set the PROM mode and use the pins shown in Table 17-1. No address input
pin is used. To update the address, the clock signal input from the CLK pin is used.
Table 17-1. Pins Used to Write, Read, and Verify Program Memory
Symbol
Function
V
PP
Applies program voltage (12.5 V)
CLK
Inputs clock to update address
MD0-MD3
Selects operation mode
D0-D7
Inputs/outputs 8-bit data
V
DD
Applies supply voltage (6 V)
17.1 Operation Mode When Writing, Reading, and Verifying Program Memory
The
μ
PD61P24 enters the program memory write, read, or verify mode if +6 V is applied to the V
DD
pin and +12.5
V is applied to the V
PP
pin after the reset status has been held a certain time (V
DD
= 5 V, AC = low level).
In this mode, the operation modes listed in Table 17-2 can be selected by using the MD0 through MD3 pins.
Any input pins not used for writing, reading, or verifying the program memory must be open or connected to GND
via a pull-down resistor (470
).
Table 17-2. Operating Mode When Writing, Reading, and Verifying Program Memory
Specifies Operation Mode
Operation Mode
V
PP
V
DD
MD0
MD1
MD2
MD3
+12.5 V
+6 V
H
L
H
L
Clears program memory address to 0
L
H
H
H
Write mode
L
L
H
H
Read and verify modes
H
×
H
H
Program inhibit mode
×
: don’t care (L or H)
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