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AT89C1051 Datasheet(PDF) 7 Page - ATMEL Corporation

Part # AT89C1051
Description  8-Bit Microcontroller with 1K Byte Flash
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C1051 Datasheet(HTML) 7 Page - ATMEL Corporation

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AT89C1051
4-9
Chip Erase: The entire PEROM array (1K byte) and the
two Lock Bits are erased electrically by using the proper
combination of control signals and by holding P3.2 low for
10 ms. The code array is written with all “1”s in the Chip
Erase operation and must be executed before any non-
blank memory byte can be re-programmed.
Reading the Signature Bytes: The signature bytes are
read by the same procedure as a normal verification of
locations 000H, 001H, and 002H, except that P3.5 and
P3.7 must be pulled to a logic low. The values returned are
as follows.
(000H) = 1EH indicates manufactured by Atmel
(001H) = 11H indicates 89C1051
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.
Figure 3. Programming the Flash Memory
Figure 4. Verifying the Flash Memory
P3.1
P3.3
P3.5
P3.2
RDY/BSY
PROG
SEE FLASH
PROGRAMMING
MODES TABLE
TO INCREMENT
ADDRESS COUNTER
P1
5V
P3.4
PGM
DATA
V/ V
I H
PP
P3.7
RST
XTAL1
GND
V
CC
AT89C1051
P3.3
P3.5
P3.2
P1
5V
P3.4
PGM
DATA
V
I H
V
I H
P3.7
RST
XTAL1
GND
V
CC
AT89C1051
SEE FLASH
PROGRAMMING
MODES TABLE


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