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AT89S52 Datasheet(PDF) 23 Page - ATMEL Corporation

Part # AT89S52
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89S52 Datasheet(HTML) 23 Page - ATMEL Corporation

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23
1919D–MICRO–6/08
AT89S52
22. Programming Interface – Parallel Mode
Every code byte in the Flash array can be programmed by using the appropriate combination of
control signals. The write operation cycle is self-timed and once initiated, will automatically time
itself to completion.
Most major worldwide programming vendors offer support for the Atmel AT89 microcontroller
series. Please contact your local programming vendor for the appropriate software revision.
Notes:
1. Each PROG pulse is 200 ns - 500 ns for Chip Erase.
2. Each PROG pulse is 200 ns - 500 ns for Write Code Data.
3. Each PROG pulse is 200 ns - 500 ns for Write Lock Bits.
4. RDY/BSY signal is output on P3.0 during programming.
5. X = don’t care.
Table 22-1.
Flash Programming Modes
Mode
V
CC
RST
PSEN
ALE/
PROG
EA/
V
PP
P2.6
P2.7
P3.3
P3.6
P3.7
P0.7-0
Data
P2.4-0
P1.7-0
Address
Write Code Data
5V
H
L
(2)
12V
L
HHHH
D
IN
A12-8
A7-0
Read Code Data
5V
H
L
H
H
L
L
L
H
H
D
OUT
A12-8
A7-0
Write Lock Bit 1
5V
H
L
(3)
12V
HHHHH
X
X
X
Write Lock Bit 2
5V
H
L
(3)
12V
H
H
H
L
L
X
X
X
Write Lock Bit 3
5V
H
L
(3)
12V
H
L
H
H
L
X
X
X
Read Lock Bits
1, 2, 3
5V
H
L
H
H
H
H
L
H
L
P0.2,
P0.3,
P0.4
XX
Chip Erase
5V
H
L
(1)
12V
HLHL
L
X
X
X
Read Atmel ID
5V
H
L
H
H
LLLLL
1EH
X 0000
00H
Read Device ID
5V
H
L
H
H
LLLLL
52H
X 0001
00H
Read Device ID
5V
H
L
H
H
LLLLL
06H
X 0010
00H


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