at89ls8252 ATMEL Corporation, at89ls8252 Datasheet - Page 21
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at89ls8252
Manufacturer Part Number
at89ls8252
Description
At89ls8252, Low Voltage, Downloadable Mcu With 8k Bytes Flash And 2k Bytes Eeprom. For New Designs Use At89s8253.
Manufacturer
ATMEL Corporation
Datasheet
1.AT89LS8252.pdf
(35 pages)
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Flash and EEPROM Parallel Programming Modes
Notes:
0850C–MICRO–3/06
Mode
Serial Prog. Modes
Chip Erase
Write (10K bytes) Memory
Read (10K bytes) Memory
Write Lock Bits:
Read Lock Bits:
Read Atmel Code
Read Device Code
Serial Prog. Enable
Serial Prog. Disable
Read Serial Prog. Fuse
1. “h” = weakly pulled “High” internally.
2. Chip Erase and Serial Programming Fuse require a 10-ms PROG pulse. Chip Erase needs to be performed first before
3. P3.4 is pulled Low during programming to indicate RDY/BSY.
4. “X” = don’t care
reprogramming any byte with a content other than FFH.
Bit - 1
Bit - 2
Bit - 3
Bit - 1
Bit - 2
Bit - 3
RST
H
H
H
H
H
H
H
H
H
H
H
PSEN
h
L
L
L
L
L
L
L
L
L
L
(1)
ALE/PROG
h
(2)
(2)
(2)
H
H
H
H
H
(1)
EA/V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
x
PP
P2.6
H
H
H
H
L
L
L
L
L
L
P2.7
H
H
H
H
H
L
L
L
L
L
P3.6
H
H
H
L
L
L
L
L
L
L
P3.7
H
H
H
H
H
L
L
L
L
L
AT89LS8252
Data I/O
P0.7 = 0
P0.6 = 0
P0.5 = 0
P0.0 = 0
P0.0 = 1
P0.7:0
@P0.2
@P0.1
@P0.0
@P0.0
DOUT
DOUT
DOUT
DOUT
DIN
DIN
X
P2.5:0 P1.7:0
Address
ADDR
ADDR
30H
31H
X
X
X
X
X
X
X
X
X
X
X
X
21