ATMEGA323L-4AI Atmel, ATMEGA323L-4AI Datasheet - Page 112

• Manufacturer Part Number: ATMEGA323L-4AI
• Description: IC AVR MCU 32K LV 4MZ IND 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA323L-4AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• 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, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA323L4AI

Assembly Code Example
Master Transmitter Mode
112
ATmega323(L)
–
Figure 55. Formats and States in the Master Transmitter Mode
Successfull
Transmission
to a Slave
Receiver
Next Transfer
Started with a
Repeated Start
Condition
Not Acknowledge
Received after the
Slave Address
Not Acknowledge
Received after a Data
Byte
Arbitration Lost in Slave
Address or Data Byte
Arbitration Lost and
Addressed as Slave
;The Slave being addressed has address 0x64. The code examples also assumes
some sort of error handling routine named ERROR.
;Part specific include file and TWI include file must be included.
; <Initialize registers, including TWAR, TWBR and TWCR>
wait1: in
From Master to Slave
From Slave to Master
ldi
out
sbrs r16,TWINT
rjmp wait1
in
cpi
brne ERROR
$08
S
r16, (1<<TWSTA) | (1<<TWEN)
TWCR, r16
r16,TWCR
r16, TWSR
r16, START
SLA
W
MT
A or A
DATA
$20
$18
$38
$68
A
A
A
; Send START condition
; Wait for TWINT Flag set. This indicates that
; the START condition has been transmitted
; Check value of TWI Status Register.
; If status different from START go to ERROR
$78
Other Master
Other Master
n
Continues
Continues
P
$B0
DATA
A
Any Number of Data Bytes
and their Associated Acknowledge Bits
This Number (Contained in TWSR) Corresponds
to a Defined State of the Two-wire Serial Bus
A or A
$28
$30
$38
To Corresponding
States in Slave Mode
A
A
Other Master
Continues
$10
P
S
P
SLA
1457G–AVR–09/03
W
R
MR