STM8S datasheet(285/467 Pages) STMICROELECTRONICS

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RM0016

Serial peripheral interface (SPI)

287

20.4.4

SPI status register (SPI_SR)

Address offset: 0x03

Reset value: 0x02

654

3210

BSY

OVR

MODF

CRCERR

WKUP

Reserved

TXE

RXNE

rc_w0

Bit 7 BSY: Busy flag

0: SPI not busy

1: SPI is busy in communication

This flag is set and reset by hardware.

Note: BSY flag must be used with cautious: refer to Section 20.3.7: Status flags on page 277 and

Section 20.3.8: Disabling the SPI on page 277

Bit 6 OVR: Overrun flag

0: No Overrun occurred

1: Overrun occurred

This flag is set by hardware and reset by a software sequence.

Bit 5 MODF: Mode fault

0: No Mode fault occurred

1: Mode fault occurred

This flag is set by hardware and reset by a software sequence.

Bit 4 CRCERR: CRC error flag

0: CRC value received matches the SPI_RXCRCR value

1: CRC value received does not match the SPI_RXCRCR value

This flag is set by hardware and cleared by software writing 0.

Bit 3 WKUP: Wakeup flag

0: No wakeup event occurred

1: Wakeup event occurred

This flag is set on the first sampling edge on SCK when the STM8 is in Halt mode and the SPI is

configured as slave.

This flag is reset by software writing 0.

Bit 2 Reserved

Bit 1 TXE: Transmit buffer empty

0: Tx buffer not empty

1: Tx buffer empty

Bit 0 RXNE: Receive buffer not empty

0: Rx buffer empty

1: Rx buffer not empty

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