參數(shù)資料
型號: μPD75P3216
廠商: NEC Corp.
英文描述: 4 Bit Single Chip Microcontrollers(4位單片微控制器)
中文描述: 4位單片微控制器(4位單片微控制器)
文件頁數(shù): 25/56頁
文件大?。?/td> 347K
代理商: ΜPD75P3216
25
m
PD75P3216
8. ONE-TIME PROM (PROGRAM MEMORY) WRITE AND VERIFY
The program memory contained in the
m
PD75P3216 is a 16384
8-bit one-time PROM that can be electrically written
one time only. The pins listed in the table below are used for this PROM’s write/verify operations. Clock input from the
X1 pin is used instead of address input as a method for updating addresses.
Pin
Function
V
PP
Pin where program voltage is applied during program
memory write/verify (usually V
DD
potential)
X1, X2
Clock input pins for address updating during program
memory write/verify. Input the X1 pin’s inverted signal to
the X2 pin.
MD0 to MD3
Operation mode selection pin for program memory write/
verify
D0/P60/KR0-D3/P63/KR3 (lower 4 bits)
D4/P50-D7/P53 (upper 4 bits)
8-bit data I/O pins for program memory write/verify
V
DD
Pin where power supply voltage is applied. Applies 1.8 to
5.5 V in normal operation mode and +6 V for program
memory write/verify.
Caution
Pins not used for program memory write/verify should be connected to Vss.
8.1 Operation Modes for Program Memory Write/Verify
When +6 V is applied to the V
DD
pin and +12.5 V to the V
PP
pin, the
m
PD75P3216 enters the program memory write/
verify mode. The following operation modes can be specified by setting pins MD0 to MD3 as shown below.
Operation Mode Specification
Operation Mode
V
PP
V
DD
MD0
MD1
MD2
MD3
+12.5 V
+6 V
H
L
H
L
Zero-clear program memory address
L
H
H
H
Write mode
L
L
H
H
Verify mode
H
X
H
H
Program inhibit mode
X: L or H
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