ATmega88 datasheet(195/340 Pages) ATMEL

195 / 340 page

195

7530H–AVR–02/09

ATmega48/88/168 Automotive

Note:

1. 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)

USART_Init:

clr

r18

out

UBRRnH,r18

out

UBRRnL,r18

; Setting the XCKn port pin as output, enables master mode.

sbi

XCKn_DDR, XCKn

; Set MSPI mode of operation and SPI data mode 0.

ldi

r18, (1<<UMSELn1)|(1<<UMSELn0)|(0<<UCPHAn)|(0<<UCPOLn)

out

UCSRnC,r18

; Enable receiver and transmitter.

ldi

r18, (1<<RXENn)|(1<<TXENn)

out

UCSRnB,r18

; Set baud rate.

; IMPORTANT: The Baud Rate must be set after the transmitter is enabled!

out

UBRRnH, r17

out

UBRRnL, r18

ret

C Code Example(1)

void

USART_Init( unsigned int baud )

{

UBRRn = 0;

/* Setting the XCKn port pin as output, enables master mode. */

XCKn_DDR |= (1<<XCKn);

/* Set MSPI mode of operation and SPI data mode 0. */

UCSRnC = (1<<UMSELn1)|(1<<UMSELn0)|(0<<UCPHAn)|(0<<UCPOLn);

/* Enable receiver and transmitter. */

UCSRnB = (1<<RXENn)|(1<<TXENn);

/* Set baud rate. */

/* IMPORTANT: The Baud Rate must be set after the transmitter is enabled

UBRRn = baud;

}

ATmega88 Datasheet(PDF) 195 Page - ATMEL Corporation

ATmega88 Datasheet(HTML) 195 Page - ATMEL Corporation

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