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AT89S52-24PU Datasheet(PDF) 27 Page - ATMEL Corporation

Part No. AT89S52-24PU
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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27
1919D–MICRO–6/08
AT89S52
Note:
1. B1 = 0, B2 = 0 ---> Mode 1, no lock protection
B1 = 0, B2 = 1 ---> Mode 2, lock bit 1 activated
B1 = 1, B2 = 0 ---> Mode 3, lock bit 2 activated
B1 = 1, B2 = 1 ---> Mode 4, lock bit 3 activated
After Reset signal is high, SCK should be low for at least 64 system clocks before it goes high to
clock in the enable data bytes. No pulsing of Reset signal is necessary. SCK should be no faster
than 1/16 of the system clock at XTAL1.
For Page Read/Write, the data always starts from byte 0 to 255. After the command byte and
upper address byte are latched, each byte thereafter is treated as data until all 256 bytes are
shifted in/out. Then the next instruction will be ready to be decoded.
Table 24-1.
Serial Programming Instruction Set
Instruction
Instruction
Format
Operation
Byte 1Byte 2Byte 3Byte 4
Programming Enable
1010 1100
0101 0011
xxxx xxxx
xxxx xxxx
0110 1001
(Output on
MISO)
Enable Serial Programming
while RST is high
Chip Erase
1010 1100
100x xxxx
xxxx xxxx
xxxx xxxx
Chip Erase Flash memory
array
Read Program Memory
(Byte Mode)
0010 0000
xxx
Read data from Program
memory in the byte mode
Write Program Memory
(Byte Mode)
0100 0000
xxx
Write data to Program
memory in the byte mode
Write Lock Bits(1)
1010 1100
1110 00
xxxx xxxx
xxxx xxxx
Write Lock bits. See Note (1).
Read Lock Bits
0010 0100
xxxx xxxx
xxxx xxxx
xxx
xx
Read back current status of
the lock bits (a programmed
lock bit reads back as a “1”)
Read Signature Bytes
0010 1000
xxx
xxx xxx0
Signature Byte
Read Signature Byte
Read Program Memory
(Page Mode)
0011 0000
xxx
Byte 0
Byte 1...
Byte 255
Read data from Program
memory in the Page Mode
(256 bytes)
Write Program Memory
(Page Mode)
0101 0000
xxx
Byte 0
Byte 1...
Byte 255
Write data to Program
memory in the Page Mode
(256 bytes)
} Eachofthelockbitmodesneedstobeactivatedsequentially
before Mode 4 can be executed.




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