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參數(shù)資料
| 型號： | 89LS8252 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-Bit Microcontroller with 8K Bytes Flash |
| 中文描述： | 8位具有8K字節(jié)的閃存，微控制器 |
| 文件頁數(shù)： | 21/31頁 |
| 文件大小： | 470K |
| 代理商： | 89LS8252 |
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AT89LS8252
4-157
Flash and EEPROM Parallel Programming Modes
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
Mode
RST
PSEN
ALE/PROG
EA/V
PP
P2.6
P2.7
P3.6
P3.7
Data I/O
P0.7:0
Address
P2.5:0 P1.7:0
Serial Prog. Modes
H
h
(1)
h
(1)
x
Chip Erase
H
L
12V
H
L
L
L
X
X
Write (10K bytes) Memory
H
L
12V
L
H
H
H
DIN
ADDR
Read (10K bytes) Memory
H
L
H
12V
L
L
H
H
DOUT
ADDR
Write Lock Bits:
H
L
12V
H
L
H
L
DIN
X
Bit - 1
P0.7 = 0
X
Bit - 2
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
H
L
H
12V
L
L
L
L
DOUT
31H
Serial Prog. Enable
H
L
12V
L
H
L
H
P0.0 = 0
X
Serial Prog. Disable
H
L
12V
L
H
L
H
P0.0 = 1
X
Read Serial Prog. Fuse
H
L
H
12V
H
H
L
H
@P0.0
X
(2)
(2)
(2)
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