ATMEGA323L-4AI Atmel, ATMEGA323L-4AI Datasheet - Page 115

• 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 Receiver Mode
1457G–AVR–09/03
Figure 56. Formats and States in the Master Receiver Mode
Successfull
Reception
from a Slave
Receiver
Next Transfer
Started with a
Repeated Start
Condition
Not Acknowledge
Received after the
Slave Address
Arbitration Lost in Slave
Address or Data Byte
Arbitration Lost and
Addressed as Slave
;Part specific include file and TWI include file must be included.
; <Initialize registers TWAR and TWBR>
wait5:in
wait6:in
From Master to Slave
From Slave to Master
$08
S
ldi
sbrs r16, TWINT
rjmp wait5
in
cpi
brne ERROR
ldi
out
ldi
out
sbrs r16, TWINT
rjmp wait6
out
SLA
r16, (1<<TWINT) | (1<<TWSTA) | (1<<TWEN)
r16,TWCR
r16, TWSR
r16, START
r16, 0xc9
TWDR, r16
r16, (1<<TWINT) | (1<<TWEN)
TWCR, r16
r16,TWCR
R
TWCR, r16
MR
A or A
DATA
$40
$48
$38
$68
A
A
A
$78
Other Master
Other Master
n
Continues
Continues
P
;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
; Load SLA+R into TWDR Register
; Clear TWINT bit in TWCR to start transmission
; of SLA+R
; Wait for TWINT Flag set. This indicates that
; SLA+R has been transmitted, and ACK/NACK has
; been received
$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
$50
$38
To Corresponding
States in Slave Mode
A
A
Other Master
DATA
Continues
ATmega323(L)
$58
A
$10
P
S
SLA
W
R
115
MT