參數(shù)資料
型號(hào): MR80C32-20/883:D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44
封裝: LCC-44
文件頁(yè)數(shù): 78/103頁(yè)
文件大?。?/td> 25028K
169
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
The following code examples show how to initialize the SPI as a Slave and how to perform a
simple reception.
Note:
Assembly Code Example
SPI_SlaveInit:
; Set MISO output, all others input
ldi
r17,(1<<DD_MISO)
out
DDR_SPI,r17
; Enable SPI
ldi
r17,(1<<SPE)
out
SPCR,r17
ret
SPI_SlaveReceive:
; Wait for reception complete
sbis
SPSR,SPIF
rjmp
SPI_SlaveReceive
; Read received data and return
in
r16,SPDR
ret
C Code Example
void
SPI_SlaveInit(void)
{
/* Set MISO output, all others input */
DDR_SPI = (1<<DD_MISO);
/* Enable SPI */
SPCR = (1<<SPE);
}
char
SPI_SlaveReceive(void)
{
/* Wait for reception complete */
while
(!(SPSR & (1<<SPIF)))
;
/* Return Data Register */
return
SPDR;
}
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