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參數(shù)資料
| 型號： | 89S8252 |
| 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)： | 20/31頁 |
| 文件大?。?/td> | 455K |
| 代理商： | 89S8252 |
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AT89S8252
4-124
Instruction Set
Notes:
1. DATA polling is used to indicate the end of a write cycle which typically takes less than 2.5 ms at 5V.
2. “aaaaa” = high order address.
3. “x” = don’t care.
Instruction
Input Format
Operation
Byte 1
Byte 2
Byte 3
Programming Enable
1010 1100
0101 0011
xxxx xxxx
Enable serial programming interface after RST goes high.
Chip Erase
1010 1100
xxxx x100
xxxx xxxx
Chip erase both 8K & 2K memory arrays.
Read Code Memory
aaaa a001
low addr
xxxx xxxx
Read data from Code memory array at the selected address.
The 5 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 Code Memory
aaaa a010
low addr
data in
Write data to Code memory location at selected address. The
address bits are the 5 MSBs of the first byte together with the
second byte.
Read Data Memory
00aa a101
low addr
xxxx xxxx
Read data from Data memory array at selected address. Data
are available at pin MISO during the third byte.
Write Data Memory
00aa a110
low addr
data in
Write data to Data memory location at selected address.
Write Lock Bits
1010 1100
x x111
xxxx xxxx
Write lock bits.
Set LB1, LB2 or LB3 = “0” to program lock bits.
Serial Programming Algorithm
To program and verify the AT89S8252 in the serial pro-
gramming mode, the following sequence is recommended:
1.
Power-up sequence:
Apply power between V
CC
and GND pins.
Set RST pin to “H”.
If a crystal is not connected across pins XTAL1 and
XTAL2, apply a 3 MHz to 24 MHz clock to XTAL1 pin
and wait for at least 10 milliseconds.
2.
Enable serial programming by sending the Program-
ming Enable serial instruction to pin MOSI/P1.5. The
frequency of the shift clock supplied at pin SCK/P1.7
needs to be less than the CPU clock at XTAL1 divided
by 40.
3.
The Code or Data array is programmed one byte at a
time by supplying the address and data together with
the appropriate Write instruction. The selected memory
location is first automatically erased before new data is
written. The write cycle is self-timed and typically takes
less than 2.5 ms at 5V.
Any memory location can be verified by using the Read
instruction which returns the content at the selected
address at serial output MISO/P1.6.
At the end of a programming session, RST can be set
low to commence normal operation.
Power-off sequence (if needed):
Set XTAL1 to “L” (if a crystal is not used).
Set RST to “L”.
Turn V
CC
power off.
Serial Programming Instruction
The Instruction Set for Serial Programming follows a 3-byte
protocol and is shown in the following table:
4.
5.
L
L
L
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