ATmega64A datasheet(171/392 Pages) ATMEL

171 / 392 page

171

8160C–AVR–07/09

ATmega64A

19.5

19.5.1

SPCR – SPI Control Register

• Bit 7 – SPIE: SPI Interrupt Enable

This bit causes the SPI interrupt to be executed if SPIF bit in the SPSR Register is set and the if

the Global Interrupt Enable bit in SREG is set.

• Bit 6 – SPE: SPI Enable

When the SPE bit is written to one, the SPI is enabled. This bit must be set to enable any SPI

operations.

• Bit 5 – DORD: Data Order

When the DORD bit is written to one, the LSB of the data word is transmitted first.

When the DORD bit is written to zero, the MSB of the data word is transmitted first.

• Bit 4 – MSTR: Master/Slave Select

This bit selects Master SPI mode when written to one, and Slave SPI mode when written logic

zero. If SS is configured as an input and is driven low while MSTR is set, MSTR will be cleared,

and SPIF in SPSR will become set. The user will then have to set MSTR to re-enable SPI Mas-

ter mode.

• Bit 3 – CPOL: Clock Polarity

When this bit is written to one, SCK is high when idle. When CPOL is written to zero, SCK is low

when idle. Refer to Figure 19-3 on page 170 and Figure 19-4 on page 170 for an example. The

CPOL functionality is summarized below:

• Bit 2 – CPHA: Clock Phase

The settings of the Clock Phase bit (CPHA) determine if data is sampled on the leading (first) or

trailing (last) edge of SCK. Refer to Figure 19-3 on page 170 and Figure 19-4 on page 170 for an

example. The CPHA functionality is summarized below:

Bit

7654

3210

0x0D (0x2D)

SPIE

SPE

DORD

MSTR

CPOL

CPHA

SPR1

SPR0

SPCR

Read/Write

R/W

Initial Value

0000

Table 19-3.

CPOL Functionality

CPOL

Leading Edge

Trailing Edge

Rising

Falling

Rising

Table 19-4.

CPHA Functionality

CPHA

Leading Edge

Trailing Edge

Sample

Setup

Sample

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