Rainbow-electronics ATmega161L Instrukcja Użytkownika Pobierz pdf (Strona 123)

123

ATmega161(L)

1228C–AVR–08/02

Reading the Flash The algorithm for reading the Flash memory is as follows (refer to “Programming the

Flash” on page 120 for details on command and address loading):

1. A: Load Command “0000 0010”.

2. H: Load Address High Byte ($00 - $1F)

3. B: Load Address Low Byte ($00 - $FF)

4. Set OE

to “0”, and BS1 to “0”. The Flash word Low byte can now be read at

DATA.

5. Set BS to “1”. The Flash word High byte can now be read at DATA.

6. Set OE

to “1”.

Reading the EEPROM The algorithm for reading the EEPROM memory is as follows (refer to “Programming the

Flash” on page 120 for details on command and address loading):

1. A: Load Command “0000 0011”.

2. H: Load Address High Byte ($00 - $01)

3. B: Load Address ($00 - $FF)

4. Set OE

to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at

DATA.

5. Set OE

to “1”.

Programming the Fuse Bits The algorithm for programming the Fuse bits is as follows (refer to “Programming the

Flash” on page 120 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.

Bit 6 = BOOTRST Fuse bit

Bit 5 = SPIEN Fuse bit

Bit 4 = SUT Fuse bit

Bit 3 = “1”. This bit is reserved and must be left unprogrammed (“1”).

Bits 2 - 0 = CKSEL2..0 Fuse bits

Bit 7 = “1”. This bit is reserved and should be left unprogrammed (“1”).

3. Give WR

a negative pulse and wait for RDY/BSY to go high.

Programming the Lock Bits The algorithm for programming the Lock bits is as follows (refer to “Programming the

Flash” on page 120 for details on command and data loading):

1. A: Load Command “0010 0000”.

2. D: Load Data Low Byte. Bit n = “0” programs the Lock bit.

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

Bits 7 - 6 = “1”. These bits are reserved and should be left unprogrammed (“1”).

3. L: Write Data Low Byte.

The Lock bits can only be cleared by executing Chip Erase.

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