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8051AHP View Datasheet(PDF) - Intel

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8051AHP Datasheet PDF : 21 Pages
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inlA
MCS” 51 CONTROLLER
Programming the 8751BH/8752BH
To be programmed, the 875XBH must be running
with a 4 to 6 MHz oscillator. (The reason the oscilla-
tor needs to be running is that the internal bus is
being used to transfer address and program data to
appropriate internal registers.) The address of an
EPROM location to be programmed is applied to
Porl 1 and pins P2.O- P2.4 of Port 2, while the code
byte to be programmed into that location is applied
to Port O. The other Port 2 and 3 pins, and RST,
PSEN, and ~/Vpp should be held at the “Program”
levels indicated in Table 1. ALE/PROG is pulsed low
to croaram the code bvte into the addressed
EPROfl location. The setu’p is shown in Figure 8.
Normally ~&is
held at a logic high until just
before ALE/PROG is to be pulsed. Then ~/Vpp is
raised to Vpp, ALE/PROG is pulsed low, and then
~/Vpp is returned to a valid high voltage. The volt-
age on the ~/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 that the ~/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 volt-
age level can cause permanent damage to the de-
vice. The Vpp source should be well regulated and
free of glitches.
+5V
Vcc
Po
1~
RST
E/vpp ~
+12.75V
ALE/PROG ~25
1~
P3.6
100 p, PULSESTO GND
875X,, ~ ~“
1~
P3.7
P2.7 ~1
ulJ-
4-6 MHz
T=
XTAL2
; XTAL1
‘ks
P2.6 ~o
P2.O
-P2,4
=
Fig. ure8. Programmingthe EPROM
272318-15
Table4. EPROMProgrammingModeafor 875XBH
MODE
RST
PSEN
—PARLOE/G
ml
Vpp
P2.7
P2.6
Program Code Data
1
0
o*
Vpp
1
0
Verify Code Data
1
0
1
1
0
0
Program Encryption Tabie
1
0
Use Addresses O-1FH
Program Lock ~= 1
1
0
Bits (LBx)
x=2
1
0
o*
Vpp
1
0
o*
Vpp
1
1
o*
Vpp
1
1
Read Signature
1
0
1
1
0
0
NOTES:
“1” = Validhighfor that pin
“O” = Validlowfor that pin
“vpp” = + 12.75V+ 0.25V
*ALE/PROGis pulsedlowfor 100USfor programming(.Quick-PulseProgramming)
P3.6
1
1
0
1
0
0
P3.7
1
1
1
1
0
0
17
 

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