ATMEGA8A-AUR Atmel, ATMEGA8A-AUR Datasheet - Page 183

• Manufacturer Part Number: ATMEGA8A-AUR
• Description: MCU AVR 8KB FLASH 16MHZ 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8A-AUR

• 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: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20.6.4
8159D–AVR–02/11
Slave Receiver Mode
Figure 20-14. Formats and States in the Master Receiver Mode
In the Slave Receiver mode, a number of data bytes are received from a Master Transmitter
(see
are zero or are masked to zero.
Table 20-5.
To initiate the Slave Receiver mode, TWAR and TWCR must be initialized as follows:
TWAR
value
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
Figure
SDA
SCL
20-5). All the status codes mentioned in this section assume that the prescaler bits
From master to slave
From slave to master
$08
S
Data transfer in Slave Receiver mode
TWA6
SLA
Device 1
RECEIVER
SLAVE
R
TWA5
MR
TRANSMITTER
Device 2
A or A
DATA
MASTER
$40
$48
$38
$68
A
A
A
$78
TWA4
Other master
Other master
n
continues
continues
Device’s Own Slave Address
P
$B0
DATA
Device 3
A
TWA3
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. The
prescaler bits are zero or masked to zero
........
$50
$38
To corresponding
states in slave mode
A
A
TWA2
Device n
Other master
DATA
continues
V
CC
$58
A
TWA1
R1
$10
R
P
S
ATmega8A
R2
TWA0
SLA
W
R
TWGCE
MT
183