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AT89LS51 Datasheet(PDF) 7 Page - ATMEL Corporation

Part # AT89LS51
Description  8-Bit Microcontroller with 4K Bytes Flash
PDF  16 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LS51 Datasheet(HTML) 7 Page - ATMEL Corporation

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Not
4-51
Programming Interface
Every code byte in the Flash array can be written and the
entire array can be erased by using the appropriate combi-
nation of control signals. The write operation cycle is self-
timed and once initiated, will automatically time itself to
completion.
All major programming vendors offer worldwide support for
the Atmel microcontroller series. Please contact your local
programming vendor for the appropriate software revision.
Flash Programming Modes
Note:
1. Chip Erase requires a 10-ms PROG pulse.
Figure 3. Programming the Flash
Figure 4. Verifying the Flash
Mode
RST
PSEN
ALE/PROG
EA/VPP
P2.6
P2.7
P3.6
P3.7
Write Code Data
H
L
12V
L
H
H
H
Read Code Data
H
L
H
H
L
L
H
H
Write Lock
Bit - 1
H
L
12V
H
H
H
H
Bit - 2
H
L
12V
H
H
L
L
Bit - 3
H
L
12V
HL
HL
Chip Erase
H
L
12V
H
L
L
L
Read Signature Byte
H
L
H
H
L
L
L
L
(1)
P1
P2.6
P3.6
P2.0 - P2.3
A0 - A7
ADDR.
OOOOH/OFFFH
T
SEE FLASH
PROGRAMMING
MODES
ABLE
3-12 MHz
A8 - A11
P0
+5V
P2.7
PGM
DATA
PROG
V/V
IH
PP
V
IH
ALE
P3.7
XTAL2
EA
RST
PSEN
XTAL1
GND
V
CC
AT89LV51
CC



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