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DOC7707 датащи(PDF) 141 Page - List of Unclassifed Manufacturers

номер детали DOC7707
подробное описание детали  Microcontroller with 8/16K Bytes of ISP Flash and USB Controller
PDF  307 Pages
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производитель  ETC1 [List of Unclassifed Manufacturers]
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DOC7707 датащи(HTML) 141 Page - List of Unclassifed Manufacturers

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7707F–AVR–11/10
AT90USB82/162
The following code examples show how to initialize the SPI as a Slave and how to perform a
simple reception.
Note:
1. See “About Code Examples” on page 7.
16.1
SS Pin Functionality
16.1.1
Slave Mode
When the SPI is configured as a Slave, the Slave Select (SS) pin is always input. When SS is
held low, the SPI is activated, and MISO becomes an output if configured so by the user. All
other pins are inputs. When SS is driven high, all pins are inputs, and the SPI is passive, which
Assembly Code Example
(1)
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
(1)
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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