ATMEGA8A-AUR Atmel, ATMEGA8A-AUR Datasheet - Page 177
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATMEGA8A-AUR
Manufacturer Part Number
ATMEGA8A-AUR
Description
MCU AVR 8KB FLASH 16MHZ 32TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
- Current page: 177 of 308
- Download datasheet (6Mb)
20.6.2
8159D–AVR–02/11
Master Transmitter Mode
are present in the system, some of these might transmit data to the TWI, and then SR mode
would be used. It is the application software that decides which modes are legal.
The following sections describe each of these modes. Possible status codes are described
along with figures detailing data transmission in each of the modes. These figures contain the
following abbreviations:
S: START condition
Rs: REPEATED START condition
R: Read bit (high level at SDA)
W: Write bit (low level at SDA)
A: Acknowledge bit (low level at SDA)
A: Not acknowledge bit (high level at SDA)
Data: 8-bit data byte
P: STOP condition
SLA: Slave Address
In
bers in the circles show the status code held in TWSR, with the prescaler bits masked to zero. At
these points, actions must be taken by the application to continue or complete the TWI transfer.
The TWI transfer is suspended until the TWINT Flag is cleared by software.
When the TWINT Flag is set, the status code in TWSR is used to determine the appropriate soft-
ware action. For each status code, the required software action and details of the following serial
transfer are given in
these tables.
In the Master Transmitter mode, a number of data bytes are transmitted to a Slave Receiver
(see
The format of the following address packet determines whether Master Transmitter or Master
Receiver mode is to be entered. If SLA+W is transmitted, MT mode is entered, if SLA+R is trans-
mitted, MR mode is entered. All the status codes mentioned in this section assume that the
prescaler bits are zero or are masked to zero.
Figure 20-11. Data Transfer in Master Transmitter Mode
Figure 20-12
Figure
SDA
SCL
20-11). In order to enter a Master mode, a START condition must be transmitted.
to
Figure
TRANSMITTER
Table 20-3
Device 1
MASTER
20-8, circles are used to indicate that the TWINT Flag is set. The num-
Device 2
to
RECEIVER
SLAVE
Table
20-7. Note that the prescaler bits are masked to zero in
Device 3
........
Device n
V
CC
R1
ATmega8A
R2
177
Related parts for ATMEGA8A-AUR
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATmega8A](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATMEGA8A-MU](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
MCU AVR 8K FLASH 16MHZ 32-QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA8A-PU](/photos/7/21/72189/453-28-dip_tmb.jpg)
Part Number:
Description:
MCU AVR 8K FLASH 16MHZ 28-PDIP
Manufacturer:
Atmel
Datasheet:
![ATMEGA8A-MUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
MCU AVR 8KB FLASH 16MHZ 32QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA8A-AN](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
8-bit Microcontrollers - MCU AVR 8KB FL 512B EE 1KB SRAM 16 MHZ GRN
Manufacturer:
Atmel
Datasheet:
![ATMEGA8-16AU](/photos/6/91/69154/313-32-tqfp_tmb.jpg)
Part Number:
Description:
IC AVR MCU 8K 16MHZ 5V 32TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA8-16MU](/photos/12/32/123219/atmega8-16mu_tmb.jpg)
Part Number:
Description:
IC AVR MCU 8K 16MHZ 5V 32-QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA8-16PU](/photos/7/21/72189/453-28-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 8K 16MHZ 5V 28DIP
Manufacturer:
Atmel
Datasheet: