atmega323l ATMEL Corporation, atmega323l Datasheet - Page 194

• Manufacturer Part Number: atmega323l
• Description: Atmega323 8-bit Avr Microcontroller With 32k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Programming the Fuse Low
Bits
Programming the Fuse High
Bits
Programming the Lock Bits
Reading the Fuse and Lock
Bits
194
ATmega323(L)
5. Set OE to “1”.
The algorithm for programming the Fuse Low bits is as follows (refer to “Programming
the Flash” on page 190 for details on Command and Data loading):
1. A: Load Command “0100 0000”.
2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3. Give WR a negative pulse and wait for RDY/BSY to go high.
The algorithm for programming the Fuse high bits is as follows (refer to “Programming
the Flash” on page 190 for details on Command and Data loading):
1. A: Load Command “0100 0000”.
2. C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
3. Set BS1 to “1”. This selects high data byte.
4. Give WR a negative pulse and wait for RDY/BSY to go high.
5. Set BS1 to “0”. This selects low data byte.
The algorithm for programming the Lock bits is as follows (refer to “Programming the
Flash” on page 190 for details on Command and Data loading):
1. A: Load Command “0010 0000”.
2. C: Load Data Low Byte. Bit n = “0” programs the Lock bit.
3. L: Write Data Low Byte.
The Lock bits can only be cleared by executing Chip Erase.
The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming
the Flash” on page 190 for details on Command loading):
1. A: Load Command “0000 0100”.
2. Set OE to “0”, BS2 to “0” and BS1 to “0”. The status of the Fuse Low bits can
Bit 7 = BODLEVEL Fuse bit
Bit 6 = BODEN Fuse bit
Bit 3..0 = CKSEL3..0 Fuse bits
Bit 5,4 = “1”. This bit is reserved and should be left unprogrammed (“1”).
Bit 7 = OCDEN Fuse bit
Bit 6 = JTAGEN Fuse bit
Bit 5 = SPIEN Fuse bit
Bit 3 = EESAVE Fuse bit
Bit 2..1 = BOOTSZ1..0 Fuse bits
Bit 0 = BOOTRST Fuse bit
Bit 7,6,4 = “1”. These bits are reserved and should be left unprogrammed (“1”).
Bit 5 = Boot Lock bit12
Bit 4 = Boot Lock bit11
Bit 3 = Boot Lock bit02
Bit 2 = Boot Lock bit01
Bit 1 = Lock bit2
Bit 0 = Lock bit1
Bit 7..6 = “1”. These bits are reserved and should be left unprogrammed (“1”).
now be read at DATA (“0” means programmed).
Bit 7 = BODLEVEL Fuse bit
Bit 6 = BODEN Fuse bit
Bit 3..0 = CKSEL3..0 Fuse bits
1457G–AVR–09/03