AT90PWM2 datasheet(218/365 Pages) ATMEL

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4317K–AVR–03/2013

AT90PWM2/3/2B/3B

19.4

Configuring the EUSART

19.4.1

Data Transmission – EUSART Transmitter

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.

19.4.2

Sending Frames with 5 to 8 Data Bit

In this mode the behavior is the same as the standard USART (See “Sending Frames with 5 to 8

Data Bit” in USART section).

19.4.3

Sending Frames with 9, 13, 14, 15 or 16 Data Bit

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:

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”.

TABLE 2.

Assembly Code Example

(1)

EUSART_Transmit:

; 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

EUDR,r15

sts

UDR,r16

ret

C Code Example(1)

void

EUSART_Transmit( unsigned int data )

{

/* Wait for empty transmit buffer */

while

( !( UCSRA & (1<<UDRE))) )

/* Put data into buffer, sends the data */

EUDR = data>>8;

UDR = data;

}

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