st7fmc2s7t6 STMicroelectronics, st7fmc2s7t6 Datasheet - Page 99

• Manufacturer Part Number: st7fmc2s7t6
• Description: 8-bit Mcu With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, Five Timers, Spi, Linsci
• Manufacturer: STMicroelectronics

SERIAL PERIPHERAL INTERFACE (cont’d)
10.4.4 Clock Phase and Clock Polarity
Four possible timing relationships may be chosen
by software, using the CPOL and CPHA bits (See
Figure
Note: The idle state of SCK must correspond to
the polarity selected in the SPICSR register (by
pulling up SCK if CPOL = 1 or pulling down SCK if
CPOL = 0).
The combination of the CPOL clock polarity and
CPHA (clock phase) bits selects the data capture
clock edge.
Figure 59. Data Clock Timing Diagram
59).
(from slave)
(from slave)
(to slave)
(to slave)
(from master)
(from master)
MISO
MOSI
CAPTURE STROBE
SCK
(CPOL = 1)
SCK
(CPOL = 0)
MISO
MOSI
SS
CAPTURE STROBE
SCK
(CPOL = 1)
SCK
(CPOL = 0)
SS
Note: This figure should not be used as a replacement for parametric information.
Refer to the Electrical Characteristics chapter.
MSBit
MSBit
MSBit
MSBit
Bit 6
Bit 6
Bit 6
Bit 6
Bit 5
Bit 5
Bit 5
Bit 5
CPHA = 0
CPHA = 1
Bit 4
Bit 4
Bit 4
Bit 4
Figure 59
binations of the CPHA and CPOL bits. The dia-
gram may be interpreted as a master or slave tim-
ing diagram where the SCK pin, the MISO pin and
the MOSI pin are directly connected between the
master and the slave device.
Note: If CPOL is changed at the communication
byte boundaries, the SPI must be disabled by re-
setting the SPE bit.
Bit3
Bit3
Bit3
Bit3
shows an SPI transfer with the four com-
Bit 2
Bit 2
Bit 2
Bit 2
Bit 1
Bit 1
Bit 1
Bit 1
LSBit
LSBit
LSBit
LSBit
ST7MC1/ST7MC2
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