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)： 20/48頁(yè)
文件大小： 191K
代理商： ΜPD78P9014
μ
PD78P9014
20
7. PROM PROGRAMMING
The program memory in
μ
PD78P9014 is an 8K-byte one-time PROM that can be written electrically. The pins listed
in Table 7-1 are used to write or verify this one-time PROM. For the connections for unused pins, see to “(2) PROM
programming mode” in section 1, “Pin Connection Diagram (Top View).” The method updates the address by the clock
input from the X1 pin and not the address input.
Table 7-1. Pins in the PROM Programming Mode
Pin Name
Function
V
PP
High voltage pin for setting the PROM programming mode and writing or verifying a program (usually,
the V
DD
potential)
MD0-MD3
Operating mode selection pin when writing or verifying a program
D0-D7
Data bus
X1
Address update clock input when writing or verifying a program
V
DD
Pin for setting the PROM programming mode and applying the power supply voltage. In the normal
operating mode, 1.8 to 5.5 V are applied. In the PROM programming mode, +5.5 V are applied.
7.1 Operating Modes
If +5.5 V is applied to the V
DD
pin and +
PP
pin, the PROM programming mode is entered. This
mode becomes an operating mode in Table 7-2 based on the settings of the MD0 to MD3 pins.
Table 7-2. Operating Modes in PROM Programming
V
PP
V
DD
MD0
MD1
MD2
MD3
Operating Mode
Zero clear of the program memory address
12.5
+
+5.5
H
L
H
L
Write mode
L
H
H
H
Verify mode
L
L
H
H
Program inhibit mode
H
×
H
H
X : L or H
Pins
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