AT89S852-12PC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89S852-12PC Datasheet PDF : 32 Pages
| |||
AT89S8252
Flash and EEPROM Parallel Programming Modes
Mode
Serial Prog.
Modes
Chip Erase
RST
H
H
PSEN
h(1)
L
ALE/
EA/
PROG VPP
h
x
(2)
12V
P2.6 P2.7 P3.6 P3.7
(See detail timing)
H
L
L
L
Data I/O
P0.7:0
X
Address
P2.5:0 P1.7:0
X
Write (10K bytes)
Memory
Read (10K bytes)
Memory
H
L
H
L
12V
L
H
H
H
H
12V
L
L
H
H
DIN
DOUT
ADDR
ADDR
Write Lock Bits:
H
L
12V
H
L
H
L
DIN
X
Bit - 1
Bit - 2
P0.7 = 0
X
P0.6 = 0
X
Bit - 3
P0.5 = 0
X
Read Lock Bits:
H
L
H
12V
H
H
L
L
DOUT
X
Bit - 1
@P0.2
X
Bit - 2
@P0.1
X
Bit - 3
@P0.0
X
Read Atmel Code
H
L
H
12V
L
L
L
L
DOUT
30H
Read Device
Code
Serial Prog.
Enable
Serial Prog.
Disable
H
L
H
12V
L
L
L
L
DOUT
31H
H
L
(2)
12V
L
H
L
H
P0.0 = 0
X
H
L
(2)
12V
L
H
L
H
P0.0 = 1
X
Read Serial Prog.
Fuse
H
L
H
12V
HH
L
H
@P0.0
X
Notes: 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 reprogramming any byte with
a content other than FFH.
3. P3.4 is pulled Low during programming to indicate RDY/BSY.
4. ’X’ = don’t care.
21
Share Link: 