AT89S8252-24QC ATMEL [ATMEL Corporation], AT89S8252-24QC Datasheet - Page 22

• Manufacturer Part Number: AT89S8252-24QC
• Description: 8-bit Microcontroller with 8K Bytes Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Flash and EEPROM Parallel Programming Modes
Notes:
22
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 per-
formed first before reprogramming any byte with a
content other than FFH.
AT89S8252
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
H
H
H
H
H
(1)
(2)
(2)
(2)
EA/V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
x
PP
3. P3.4 is pulled Low during programming to indicate
4. “X” = don’t care
P2.6
H
H
H
H
L
L
L
L
L
L
RDY/BSY.
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
Data I/O
P0.7 = 0
P0.6 = 0
P0.5 = 0
P0.0 = 0
P0.0 = 1
P0.7:0
@P0.0
@P0.2
@P0.1
@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