AT90PWM2 datasheet(196/365 Pages) ATMEL

196 / 365 page

196

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

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”.

TABLE 2.

Assembly Code Example(1)

USART_Receive:

; Wait for data to be received

sbis

UCSRA, RXC0

rjmp

USART_Receive

; Get status and 9th bit, then data from buffer

lds

r18, UCSRA

lds

r17, UCSRB

lds

r16, UDR

; If error, return -1

andi

r18,(1<<FE0)|(1<<DOR0)|(1<<UPE0)

breq

USART_ReceiveNoError

ldi

r17, HIGH(-1)

ldi

r16, LOW(-1)

USART_ReceiveNoError:

; Filter the 9th bit, then return

lsr

r17

andi

r17, 0x01

ret

C Code Example(1)

unsigned int

USART_Receive( void )

{

unsigned char

status, resh, resl;

/* Wait for data to be received */

while

( !(UCSRA & (1<<RXC0)) )

;

/* Get status and 9th bit, then data */

/* from buffer */

status = UCSRA;

resh = UCSRB;

resl = UDR;

/* If error, return -1 */

( status & (1<<FE0)|(1<<DOR0)|(1<<UPE0) )

return

-1;

/* Filter the 9th bit, then return */

resh = (resh >> 1) & 0x01;

return

((resh << 8) | resl);

}

AT90PWM2 Datasheet(PDF) 196 Page - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 196 Page - ATMEL Corporation

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