ATmega1284P datasheet(182/380 Pages) ATMEL

tên linh kiện	ATmega1284P

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

PDF	380 Pages

Scroll/Zoom	100%

nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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182 / 380 page

182

8059D–AVR–11/09

ATmega1284P

Note:

1. See “About Code Examples” on page 6.

The receive function example reads all the I/O Registers into the Register File before any com-

putation is done. This gives an optimal receive buffer utilization since the buffer location read will

be free to accept new data as early as possible.

Assembly Code Example

(1)

USART_Receive:

; Wait for data to be received

sbis

UCSRnA, RXCn

rjmp

USART_Receive

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

r18, UCSRnA

r17, UCSRnB

r16, UDRn

; If error, return -1

andi

r18,(1<<FEn)|(1<<DORn)|(1<<UPEn)

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

( !(UCSRnA & (1<<RXCn)) )

;

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

/* from buffer */

status = UCSRnA;

resh = UCSRnB;

resl = UDRn;

/* If error, return -1 */

( status & (1<<FEn)|(1<<DORn)|(1<<UPEn) )

return

-1;

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

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

return

((resh << 8) | resl);

}

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