參數(shù)資料
型號(hào)： μPD78P064
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁數(shù)： 22/70頁
文件大小： 473K
代理商： ΜPD78P064
22
m
PD78P064
4.
PROM PROGRAMMING
The
m
PD78P064 has an on-chip 32K-byte PROM as a program memory. For programming, set the PROM programming
mode by the V
PP
and RESET pins. For processing unused pins, refer to
PIN CONFIGURATION (2) PROM programming
mode
.
Caution
When writing in a program, use locations 0000H-7FFFH. (Specify the last address as 7FFFH). You
cannot write in using a PROM programmer that cannot specify the addresses to write.
4.1
OPERATING MODES
When +5 V or +12.5 V is applied to the V
PP
pin and a low level signal is applied to the RESET pin, the PROM programming
mode is set. This mode will become the operating mode as shown in Table 4-1 when the CE, OE and PGM pins are set
as shown.
Further, when the read mode is set, it is possible to read the contents of the PROM.
Table 4-1. Operating Modes of PROM Programming
Pin
RESET
V
PP
V
DD
CE
OE
PGM
D0 to D7
Operating Mode
Page data latch
L
+12.5 V
+6.5 V
H
L
H
Data input
Page write
H
H
L
High-impedance
Byte write
L
H
L
Data input
Program verify
L
L
H
Data output
Program inhibit
￥
H
H
High-impedance
￥
L
L
Read
+5 V
+5 V
L
L
H
Data output
Output disable
L
H
￥
High-impedance
Standby
H
￥
￥
High-impedance
￥
: L or H
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