ST7LITE20F2 datasheet(102/166 Pages) STMICROELECTRONICS

102 / 166 page

On-chip peripherals

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Doc ID 8349 Rev 5

Note:

While the SPIF bit is set, all writes to the SPIDR register are inhibited until the SPICSR

●

Bit 6 =

WCOL Write collision status (Read only)

This bit is set by hardware when a write to the SPIDR register is done during a transmit

sequence. It is cleared by a software sequence (see Figure 47: Clearing the WCOL bit

(write collision flag) software sequence).

0: No write collision occurred

1: A write collision has been detected.

●

Bit 5 =

OVR SPI Overrun error (Read only)

This bit is set by hardware when the byte currently being received in the shift register is

ready to be transferred into the SPIDR register while SPIF = 1 (See Section : Overrun

condition (OVR)). An interrupt is generated if SPIE = 1 in the SPICR register. The OVR

bit is cleared by software reading the SPICSR register.

0: No overrun error

1: Overrun error detected

●

Bit 4 =

MODF Mode fault flag (Read only).

This bit is set by hardware when the SS pin is pulled low in master mode (see Section :

Master mode fault (MODF)). An SPI interrupt can be generated if SPIE=1 in the SPICR

while MODF=1 followed by a write to the SPICR register).

0: No master mode fault detected

1: A fault in master mode has been detected

●

Bit 3 = Reserved, must be kept cleared.

●

Bit 2 =

SOD SPI output disable

This bit is set and cleared by software. When set, it disables the alternate function of

the SPI output (MOSI in master mode / MISO in slave mode).

0: SPI output enabled (if SPE=1)

1: SPI output disabled.

●

Bit 1 =

SSM SS Management.

This bit is set and cleared by software. When set, it disables the alternate function of

the SPI SS pin and uses the SSI bit value instead. See Section : Slave select

management.

0: Hardware management (SS managed by external pin)

1: Software management (internal SS signal controlled by SSI bit. External SS pin free

for general-purpose I/O).

●

Bit 0 =

SSI SS Internal Mode.

This bit is set and cleared by software. It acts as a “chip select” by controlling the level

of the SS slave select signal when the SSM bit is set.

0: Slave selected

1: Slave deselected.

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