ATMEGA32A-AN Atmel, ATMEGA32A-AN Datasheet - Page 277

• Manufacturer Part Number: ATMEGA32A-AN
• Description: IC MCU AVR 32K FLASH 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA32A-AN

• 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: 32
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K 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: 44-TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.7.9
26.7.10
26.7.11
8155C–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 272
Figure 26-5. Programming the Fuses
The algorithm for programming the Lock bits is as follows (refer to
page 272
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 272
3. Set BS1 to “0” 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.
RESET +12V
for details on Command and Data loading):
RDY/BSY
for details on Command and Data loading):
for details on Command loading):
PAGEL
XTAL1
DATA
XA1
XA0
BS1
BS2
WR
OE
$40
A
DATA
C
Write Fuse Low byte
XX
$40
A
DATA
C
“Programming the Flash” on
Write Fuse high byte
“Programming the Flash”
“Programming the Flash”
ATmega32A
XX
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