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8XC51FX Datasheet(PDF) 16 Page - Intel Corporation

No. de Pieza. 8XC51FX
Descripción  CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
Descarga  20 Pages
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Fabricante  INTEL [Intel Corporation]
Página de inicio  http://www.intel.com
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8XC51FX Datasheet(HTML) 16 Page - Intel Corporation

 
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8XC51FX
PROGRAMMING THE EPROMOTP
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 P20 - P24 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 VPP should be held at the ‘‘Program’’ levels
indicated in Table 4 ALEPROG is pulsed low to
program the code byte into the addressed EPROM
location The setup is shown in Figure 10
Normally EA VPP is held at logic high until just be-
fore ALEPROG is to be pulsed Then EA VPP is
raised to VPP ALEPROG is pulsed low and then
EA VPP is returned to a valid high voltage The volt-
age on the EA VPP pin must be at the valid EA VPP
high level before a verify is attempted Waveforms
and detailed timing specifications are shown in later
sections of this data sheet
NOTE
 EA VPP pin must not be allowed to go above the
maximum specified VPP level for any amount of
time Even a narrow glitch above that voltage lev-
el can cause permanent damage to the device
The VPP source should be well regulated and free
of glitches
Table 4 EPROM Programming Modes
Mode
RST
PSEN
ALE
EA
P26
P27
P33
P36
P37
PROG
VPP
Program Code Data
H
L
1275V
L
H
H
H
H
Verify Code Data
H
L
H
H
L
L
L
H
H
Program Encryption
H
L
1275V
L
H
H
L
H
Array Address 0 – 3FH
Program Lock
Bit 1
H
L
1275V
H
H
H
H
H
Bits
Bit 2
H
L
1275V
H
H
H
L
L
Bit 3
H
L
1275V
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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