AT89S53-24AC(2000) Просмотр технического описания (PDF) - Atmel Corporation
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AT89S53-24AC Datasheet PDF : 33 Pages
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AT89S53
Instruction Set
Instruction
Programming Enable
Chip Erase
Read Code Memory
Write Code Memory
Write Lock Bits
Input Format
Byte 1
Byte 2
Byte 3
1010 1100 0101 0011 xxxx xxxx
1010 1100 xxxx x100 xxxx xxxx
01 low addr xxxx xxxx
10 low addr data in
1010 1100
x x111 xxxx xxxx
Operation
Enable serial programming interface after RST goes
high.
Chip erase the 12K memory array.
Read data from Code memory array at the selected
address. The 6 MSBs of the first byte are the high order
address bits. The low order address bits are in the
second byte. Data are available at pin MISO during the
third byte.
Write data to Code memory location at selected
address. The address bits are the 6 MSBs of the first
byte together with the second byte.
Write lock bits.
Set LB1, LB2 or LB3 = “0” to program lock bits.
Notes: 1. DATA polling is used to indicate the end of a write cycle which typically takes less than 10 ms at 2.7V.
2. “x” = don’t care.
.
Flash Parallel Programming Modes
Mode
Serial Prog. Modes
Chip Erase
RST
H
H
PSEN
h(1)
L
ALE/PROG
h(1)
(2)
EA/VPP
x
12V
P2.6 P2.7 P3.6 P3.7
H
L
L
L
Data I/O
P0.7:0
X
Address
P2.5:0 P1.7:0
X
Write (12K bytes) Memory
H
L
12V
L
H
H
H
DIN
ADDR
Read (12K 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
Serial Prog. Enable
Serial Prog. Disable
H
L
H
L
H
L
H
12V
L
L
L
L
DOUT
31H
(2)
12V
L
H
L
H
P0.0 = 0
X
(2)
12V
L
H
L
H
P0.0 = 1
X
Read Serial Prog. Fuse
H
L
H
12V
H
H
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
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