ATMEGA8A-MU Atmel, ATMEGA8A-MU Datasheet - Page 236

• Manufacturer Part Number: ATMEGA8A-MU
• Description: MCU AVR 8K FLASH 16MHZ 32-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Controller Family/series: AVR MEGA
• No. Of I/o's: 23
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 1KB
• Cpu Speed: 16MHz
• No. Of Timers: 3
• Rohs Compliant: Yes
• Processor Series: ATMEGA8x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1 KB
• Interface Type: SPI, TWI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24.7.9
24.7.10
24.7.11
8159D–AVR–02/11
Programming the Fuse High Bits
Programming the Lock Bits
Reading the Fuse and Lock Bits
The algorithm for programming the Fuse high bits is as follows (refer to
on page 232
The algorithm for programming the Lock Bits is as follows (refer to
page 232
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
on page 232
Figure 24-3. Mapping Between BS1, BS2 and the Fuse- and Lock Bits During Read
3. Set BS1 and BS2 to “0”.
4. Give WR a negative pulse and wait for RDY/BSY to go high.
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” and BS2 to “0”. 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.
1. A: Load Command “0010 0000”.
2. C: Load Data Low byte. Bit n = “0” programs the Lock bit.
3. Give WR a negative pulse and wait for RDY/BSY to go high.
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 now be
3. Set OE to “0”, BS2 to “1”, and BS1 to “1”. The status of the Fuse High bits can now be
4. Set OE to “0”, BS2 to “0”, and BS1 to “1”. The status of the Lock Bits can now be read
5. Set OE to “1”.
read at DATA (“0” means programmed).
read at DATA (“0” means programmed).
at DATA (“0” means programmed).
for details on Command and Data loading):
for details on Command and Data loading):
for details on Command loading):
Fuse low byte
Fuse high byte
Lock bits
BS2
0
1
BS1
0
1
“Programming the Flash” on
DATA
“Programming the Flash”
“Programming the Flash”
ATmega8A
236