AT89C51-20PC(2000) View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89C51-20PC Datasheet PDF : 17 Pages
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AT89C51
Flash Programming Modes
Mode
RST
Write Code Data
H
PSEN
L
ALE/PROG
EA/VPP
H/12V
P2.6
L
P2.7
H
P3.6
H
P3.7
H
Read Code Data
H
L
Write Lock
Bit - 1
H
L
H
H
L
L
H
H
H/12V
H
H
H
H
Bit - 2
H
L
H/12V
H
H
L
L
Bit - 3
H
L
H/12V
H
L
H
L
Chip Erase
H
L
(1)
H/12V
H
L
L
L
Read Signature Byte
H
L
Note: 1. Chip Erase requires a 10 ms PROG pulse.
Figure 3. Programming the Flash
ADDR. A0 - A7
OOOOH/OFFFH
A8 - A11
AT89C51
P1
VCC
P2.0 - P2.3 P0
P2.6
SEE FLASH
PROGRAMMING
MODES TABLE
P2.7
ALE
P3.6
P3.7
XTAL2
EA
+5V
PGM
DATA
PROG
VIH/VPP
3-24 MHz
H
H
L
L
L
L
Figure 4. Verifying the Flash
ADDR. A0 - A7
OOOOH/0FFFH
A8 - A11
AT89C51
P1
VCC
P2.0 - P2.3 P0
P2.6
SEE FLASH
PROGRAMMING
MODES TABLE
P2.7
ALE
P3.6
P3.7
XTAL2
EA
+5V
PGM DATA
(USE 10K
PULLUPS)
VIH
3-24 MHz
XTAL1
RST
VIH
GND
PSEN
XTAL1
RST
VIH
GND
PSEN
7
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