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XMEGA A [MANUAL]
8077I–AVR–11/2012
20.7
Register Description
20.7.1 CTRL – Control register
Bit 7 – CLK2X: Clock Double
When this bit is set, the SPI speed (SCK frequency) will be doubled in master mode (see Table 21-3 on page 240).
Bit 6 – ENABLE: Enable
Setting this bit enables the SPI module. This bit must be set to enable any SPI operations.
Bit 5 – DORD: Data Order
DORD decides the data order when a byte is shifted out from the DATA register. When DORD is written to one, the least-
significant bit (lsb) of the data byte is transmitted first, and when DORD is written to zero, the most-significant bit (msb) of
the data byte is transmitted first.
Bit 4 – MASTER: Master Select
This bit selects master mode when written to one, and slave mode when written to zero. If SS is configured as an input
and driven low while master mode is set, master mode will be cleared.
Bit 3:2 – MODE[1:0]: Transfer Mode
These bits select the transfer mode. The four combinations of SCK phase and polarity with respect to the serial data are
shown in Table 20-2. These bits decide whether the first edge of a clock cycle (leading edge) is rising or falling, and
whether data setup and sample occur on the leading or trailing edge.
When the leading edge is rising, the SCK signal is low when idle, and when the leading edge is falling, the SCK signal is
high when idle.
Table 20-2. SPI transfer modes.
Bits 1:0 – PRESCALER[1:0]: Clock Prescaler
These two bits control the SPI clock rate configured in master mode. These bits have no effect in slave mode. The
relationship between SCK and the peripheral clock frequency ( clkPER) is shown in Table 20-3 on page 228.
Table 20-3. Relationship between SCK and the peripheral clock (Clk
PER) frequency.
Bit
76543210
+0x00
CLK2X
ENABLE
DORD
MASTER
MODE[1:0]
PRESCALER[1:0]
Read/Write
R/W
Initial Value
00000000
MODE[1:0]
Group configuration
Leading edge
Trailing edge
00
0
Rising, sample
Falling, setup
01
1
Rising, setup
Falling, sample
10
2
Falling, sample
Rising, setup
11
3
Falling, setup
Rising, sample
CLK2X
PRESCALER[1:0]
SCK frequency
0
00
ClkPER/4
0
01
ClkPER/16
0
10
ClkPER/64
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