ATMEGA323-8AC Atmel, ATMEGA323-8AC Datasheet - Page 193
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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Reading the Flash
Reading the EEPROM
1457G–AVR–09/03
3. Wait until to RDY/BSY goes high before programming the next byte.
The loaded command and address are retained in the device during programming. For
efficient programming, the following should be considered.
•
•
•
These considerations also applies to Flash, EEPROM and Signature bytes reading.
Figure 96. Programming the EEPROM Waveforms
The algorithm for reading the Flash memory is as follows (refer to “Programming the
Flash” on page 190 for details on Command and Address loading):
1. A: Load Command “0000 0010”.
2. H: Load Address High Byte ($00 - $3F)
3. B: Load Address Low Byte ($00 - $FF)
4. Set OE to “0”, and BS1 to “0”. The Flash word Low Byte can now be read at
5. Set BS to “1”. The Flash word High Byte can now be read at DATA.
6. Set OE to “1”.
The algorithm for reading the EEPROM Memory is as follows (refer to “Programming the
Flash” on page 190 for details on Command and Address loading):
1. A: Load Command “0000 0011”.
2. H: Load Address High Byte ($00 - $03)
3. B: Load Address ($00 - $FF)
4. Set OE to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at
RDY/BSY
RESET
PAGEL
XTAL1
DATA
(See Figure 96 for signal waveforms)
The command needs only be loaded once when writing or reading multiple memory
locations.
Address High Byte needs only be loaded before programming a new 256 byte
window in the EEPROM.
Skip writing the data value $FF, that is the contents of the entire EEPROM after a
Chip Erase.
DATA.
DATA.
XA1
XA2
BS1
BS2
WR
OE
+12V
$11
ADDR. HIGH
ADDR. LOW
DA TA LOW
ATmega323(L)
193
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