ATMEGA323-8AC Atmel, ATMEGA323-8AC Datasheet - Page 194
![IC AVR MCU 32K 8MHZ COM 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323-8AC
Manufacturer Part Number
ATMEGA323-8AC
Description
IC AVR MCU 32K 8MHZ COM 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8AC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238AC
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Programming the Fuse Low
Bits
Programming the Fuse High
Bits
Programming the Lock Bits
Reading the Fuse and Lock
Bits
194
ATmega323(L)
5. Set OE to “1”.
The algorithm for programming the Fuse Low bits is as follows (refer to “Programming
the Flash” on page 190 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.
3. Give WR a negative pulse and wait for RDY/BSY to go high.
The algorithm for programming the Fuse high bits is as follows (refer to “Programming
the Flash” on page 190 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.
3. Set BS1 to “1”. 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.
The algorithm for programming the Lock bits is as follows (refer to “Programming the
Flash” on page 190 for details on Command and Data loading):
1. A: Load Command “0010 0000”.
2. C: Load Data Low Byte. Bit n = “0” programs the Lock bit.
3. L: Write Data Low Byte.
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 “Programming
the Flash” on page 190 for details on Command loading):
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
Bit 7 = BODLEVEL Fuse bit
Bit 6 = BODEN Fuse bit
Bit 3..0 = CKSEL3..0 Fuse bits
Bit 5,4 = “1”. This bit is reserved and should be left unprogrammed (“1”).
Bit 7 = OCDEN Fuse bit
Bit 6 = JTAGEN Fuse bit
Bit 5 = SPIEN Fuse bit
Bit 3 = EESAVE Fuse bit
Bit 2..1 = BOOTSZ1..0 Fuse bits
Bit 0 = BOOTRST Fuse bit
Bit 7,6,4 = “1”. These bits are reserved and should be left unprogrammed (“1”).
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
Bit 7..6 = “1”. These bits are reserved and should be left unprogrammed (“1”).
now be read at DATA (“0” means programmed).
Bit 7 = BODLEVEL Fuse bit
Bit 6 = BODEN Fuse bit
Bit 3..0 = CKSEL3..0 Fuse bits
1457G–AVR–09/03
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