AT90PWM216-16SE ATMEL [ATMEL Corporation], AT90PWM216-16SE Datasheet - Page 219

• Manufacturer Part Number: AT90PWM216-16SE
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable flash
• Manufacturer: ATMEL [ATMEL Corporation]

19.4
19.4.1
19.4.2
19.4.3
7710D–AVR–08/09
Configuring the EUSART
Data Transmission – EUSART Transmitter
Sending Frames with 5 to 8 Data Bit
Sending Frames with 9, 13, 14, 15 or 16 Data Bit
The EUSART Transmitter is enabled in the same way as standard USART, by setting the Trans-
mit Enable (TXEN) bit in the UCSRB Register. When the Transmitter is enabled, the normal port
operation of the TxDn pin is overridden by the EUSART and given the function as the Transmit-
ter’s serial output. The baud rate, mode of operation and frame format must be set up once
before doing any transmissions. If synchronous operation is used, the clock on the XCK pin will
be overridden and used as transmission clock.
In this mode the behavior is the same as the standard USART (See “Sending Frames with 5 to 8
Data Bit” in USART section).
In these configurations the most significant bits (9, 13, 14, 15 or 16) should be loaded in the
EUDR register before the low byte of the character is written to UDR. The write operation in the
UDR register allows to start the transmission.
Note:
Assembly Code Example
C Code Example
TABLE 2.
EUSART_Transmit:
void EUSART_Transmit( unsigned int data )
{
}
; Wait for empty transmit buffer
sbis UCSRA,UDRE
rjmp EUSART_Transmit
; Put LSB data (r16) and MSN data (r15) into buffer, sends the data
sts
sts
ret
/* Wait for empty transmit buffer */
while ( !( UCSRA & (1<<UDRE))) )
/* Put data into buffer, sends the data */
EUDR = data>>8;
UDR = data;
The example code assumes that the part specific header file is included.
For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI”
instructions must be replaced with instructions that allow access to extended I/O. Typically “LDS”
and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.
EUDR,r15
UDR,r16
(1)
(1)
AT90PWM216/316
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