at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 259

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

22.7.8
22.7.9
22.7.10
7734M–AVR–03/10
Programming the Fuse Low Bits
Programming the Fuse High Bits
Programming the Extended Fuse Bits
The algorithm for programming the Fuse Low bits is as follows (refer to
page 256
The algorithm for programming the Fuse High bits is as follows (refer to
page 256
The algorithm for programming the Extended Fuse bits is as follows (refer to
page 256
Figure 22-5.
4.
5.
1.
2.
3.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
RESET +12V
Set OE to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at DATA.
Set OE to “1”.
A: Load Command “0100 0000”.
C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
Give WR a negative pulse and wait for RDY/BSY to go high.
A: Load Command “0100 0000”.
C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.
Set BS1 to “1” and BS2 to “0”. This selects high data byte.
Give WR a negative pulse and wait for RDY/BSY to go high.
Set BS1 to “0”. This selects low data byte.
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 “0” and BS2 to “1”. This selects extended data byte.
4. Give WR a negative pulse and wait for RDY/BSY to go high.
5. Set BS2 to “0”. This selects low data byte.
PAGEL/BS1
RDY/BSY
XA1/BS2
for details on Command and Data loading):
for details on Command and Data loading):
for details on Command and Data loading):
XTAL1
DATA
XA0
WR
OE
Programming the FUSES Waveforms
0x40
A
DATA
C
Write Fuse Low byte
XX
0x40
A
DATA
C
Write Fuse high byte
XX
0x40
A
“Programming the Flash” on
“Programming the Flash” on
“Programming the Flash” on
AT90PWM81
DATA
C
Write Extended Fuse byte
XX
259