AT90PWM2 datasheet(227/365 Pages) ATMEL

227 / 365 page

227

AT90PWM2/3

4317B–AVR–02/05

Configuring the EUSART

Data Transmission – EUSART Transmitter

The EUSART Transmitter is enabled in the same way as standard USART, by setting

the Transmit 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 Transmitter’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.

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).

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 oper-

ation 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”.

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

out

EUDR,r15

out

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;

}

AT90PWM2 Datasheet(PDF) 227 Page - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 227 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL