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參數(shù)資料
| 型號： | D87C51FB |
| 英文描述： | IC-8-BIT CMOS CPU |
| 中文描述： | 集成電路8位CMOS處理器 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 259K |
| 代理商： | D87C51FB |
8XC51FX
PROGRAMMING THE EPROM/OTP
To be programmed, the part must be running with a
4 to 6 MHz oscillator. (The reason the oscillator
needs to be running is that the internal bus is being
used to transfer address and program data to appro-
priate internal EPROM locations.) The address of an
EPROM location to be programmed is applied to
Port 1 and pins P2.0 - P2.4 of Port 2, while the code
byte to be programmed into that location is applied
to Port 0. The other Port 2 and 3 pins, RST PSEN,
and EA/V
PP
should be held at the ‘‘Program’’ levels
indicated in Table 4. ALE/PROG is pulsed low to
program the code byte into the addressed EPROM
location. The setup is shown in Figure 10.
Normally EA/V
PP
is held at logic high until just be-
fore ALE/PROG is to be pulsed. Then EA/V
PP
is
raised to V
PP
, ALE/PROG is pulsed low, and then
EA/V
PP
is returned to a valid high voltage. The volt-
age on the EA/V
PP
pin must be at the valid EA/V
PP
high level before a verify is attempted. Waveforms
and detailed timing specifications are shown in later
sections of this data sheet.
NOTE:
#
EA/V
PP
pin must not be allowed to go above the
maximum specified V
PP
level for any amount of
time. Even a narrow glitch above that voltage lev-
el can cause permanent damage to the device.
The V
PP
source should be well regulated and free
of glitches.
Table 4. EPROM Programming Modes
Mode
RST
PSEN
ALE/
PROG
EA/
V
PP
P2.6
P2.7
P3.3
P3.6
P3.7
Program Code Data
H
L
12.75V
L
H
H
H
H
Verify Code Data
H
L
H
H
L
L
L
H
H
Program Encryption
Array Address 0–3FH
H
L
12.75V
L
H
H
L
H
Program Lock
Bits
Bit 1
H
L
12.75V
H
H
H
H
H
Bit 2
H
L
12.75V
H
H
H
L
L
Bit 3
H
L
12.75V
H
L
H
H
L
Read Signature Byte
H
L
H
H
L
L
L
L
L
272322–20
*
See Table 4 for proper input on these pins
Figure 10. Programming the EPROM
16
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| D87C51FB-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| D87C51FB-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| D87C51FB-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| D87C51FB-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| D87C51FB-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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