ATMEGA8A-MUR Atmel, ATMEGA8A-MUR Datasheet - Page 144
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATMEGA8A-MUR
Manufacturer Part Number
ATMEGA8A-MUR
Description
MCU AVR 8KB FLASH 16MHZ 32QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8A-MU.pdf
(308 pages)
Specifications of ATMEGA8A-MUR
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
- Current page: 144 of 308
- Download datasheet (6Mb)
19.6.1
19.6.2
8159D–AVR–02/11
Sending Frames with 5 to 8 Data Bits
Sending Frames with 9 Data Bits
A data transmission is initiated by loading the transmit buffer with the data to be transmitted. The
CPU can load the transmit buffer by writing to the UDR I/O location. The buffered data in the
transmit buffer will be moved to the Shift Register when the Shift Register is ready to send a new
frame. The Shift Register is loaded with new data if it is in idle state (no ongoing transmission) or
immediately after the last stop bit of the previous frame is transmitted. When the Shift Register is
loaded with new data, it will transfer one complete frame at the rate given by the Baud Register,
U2X bit or by XCK depending on mode of operation.
The following code examples show a simple USART transmit function based on polling of the
Data Register Empty (UDRE) Flag. When using frames with less than eight bits, the most signif-
icant bits written to the UDR are ignored. The USART has to be initialized before the function
can be used. For the assembly code, the data to be sent is assumed to be stored in Register
R16
Note:
The function simply waits for the transmit buffer to be empty by checking the UDRE Flag, before
loading it with new data to be transmitted. If the Data Register Empty Interrupt is utilized, the
interrupt routine writes the data into the buffer.
If 9-bit characters are used (UCSZ = 7), the ninth bit must be written to the TXB8 bit in UCSRB
before the Low byte of the character is written to UDR. The following code examples show a
Assembly Code Example
C Code Example
USART_Transmit:
void USART_Transmit( unsigned char data )
{
}
; Wait for empty transmit buffer
sbis UCSRA,UDRE
rjmp USART_Transmit
; Put data (r16) into buffer, sends the data
out
ret
/* Wait for empty transmit buffer */
while ( !( UCSRA & (1<<UDRE)) )
/* Put data into buffer, sends the data */
UDR = data;
1. See “About Code Examples” on page 6.
UDR,r16
;
(1)
(1)
ATmega8A
144
Related parts for ATMEGA8A-MUR
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-AUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
MCU AVR 8KB FLASH 16MHZ 32TQFP
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: