ATMEGA8A-MUR Atmel, ATMEGA8A-MUR Datasheet - Page 236
ATMEGA8A-MUR
Manufacturer Part Number
ATMEGA8A-MUR
Description
MCU AVR 8KB FLASH 16MHZ 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
Specifications of ATMEGA8A-MUR
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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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
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