Rainbow-electronics ATmega64M1 Manual de usuario descargar pdf (Pagina 160)

100

101

160

8209A–AVR–08/09

ATmega16M1/32M1/64M1

Figure 19-3. SPI Transfer Format with CPHA = 0

Figure 19-4. SPI Transfer Format with CPHA = 1

19.5 Register Description

19.5.1 MCUCR – MCU Control Register

Bit 7– SPIPS: SPI Pin Redirection

Thanks to SPIPS (SPI Pin Select) in MCUCR Sfr, SPI pins can be redirected.

• When the SPIPS bit is written to zero, the SPI signals are directed on pins MISO,MOSI, SCK

and SS.

• When the SPIPS bit is written to one,the SPI signals are directed on alternate SPI pins,

MISO_A, MOSI_A, SCK_A and SS_A.

Note that programming port are always located on alternate SPI port.

Bit 1

Bit 6

LSB

MSB

SCK (CPOL = 0)

mode 0

SAMPLE I

MOSI/MISO

CHANGE 0

MOSI PIN

CHANGE 0

MISO PIN

SCK (CPOL = 1)

mode 2

MSB

LSB

Bit 6

Bit 1

Bit 5

Bit 2

Bit 4

Bit 3

Bit 4

Bit 2

Bit 5

MSB first (DORD = 0)

LSB first (DORD = 1)

SCK (CPOL = 0)

mode 1

SAMPLE I

MOSI/MISO

CHANGE 0

MOSI PIN

CHANGE 0

MISO PIN

SCK (CPOL = 1)

mode 3

MSB

LSB

Bit 6

Bit 1

Bit 5

Bit 2

Bit 4

Bit 3

Bit 4

Bit 2

Bit 5

Bit 1

Bit 6

LSB

MSB

MSB first (DORD = 0)

LSB first (DORD = 1)

Bit 76543210

SPIPS

– – PUD – – IVSEL IVCE MCUCR

Read/Write R/W R R R/W R R R/W R/W

Initial Value00000000

1 2 ... 155 156 157 158 159 160 161 162 163 164 165 ... 342 343

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Rainbow-electronics ATmega64M1 Manual de usuario Pagina 160

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