ATmega32U2 datasheet(142/314 Pages) ATMEL

Il numero della parte	ATmega32U2

Spiegazioni elettronici	8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller

PDF	314 Pages

Scroll/Zoom	100%

Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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142

7799B–AVR–07/09

ATmega8U2/16U2/32U2

The following code examples show how to initialize the SPI as a Slave and how to perform a

simple reception.

Note:

1. See “Code Examples” on page 6.

17.3

SS Pin Functionality

17.3.1

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

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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