AT89S8252-33QC 데이터 시트보기 (PDF) - Atmel Corporation

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AT89S8252-33QC

8-bit Microcontroller with 8K Bytes Flash

Atmel Corporation 

AT89S8252

Instruction Set

Input Format

Instruction

Byte 1

Byte 2

Byte 3 Operation

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.

Note: 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.

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