C8051F2XX Datasheet, PDF (115/146 Pages) Silicon Laboratories – Mixed Signal 8 kB ISP Flash MCU Family

C8051F2xx
SFR Definition 15.2. SPI0CN: SPI Control
R/W
SPIF
Bit7
R/W
WCOL
Bit6
R/W
MODF
Bit5
R/W
RXOVRN
Bit4
R
TXBSY
Bit3
R
SLVSEL
Bit2
R/W
MSTEN
Bit1
R/W
SPIEN
Bit0
Reset Value
00000000
SFR Address:
0xF8
Bit7:
SPIF: SPI Interrupt Flag.
This bit is set to logic 1 by hardware at the end of a data transfer. If interrupts are enabled,
setting this bit causes the CPU to vector to the SPI0 interrupt service routine. This bit is not
automatically cleared by hardware. It must be cleared by software.
Bit6:
WCOL: Write Collision Flag.
This bit is set to logic 1 by hardware (and generates a SPI interrupt) to indicate a write to the
SPI data register was attempted while a data transfer was in progress. It is cleared by soft-
ware.
Bit5:
MODF: Mode Fault Flag.
This bit is set to logic 1 by hardware (and generates a SPI interrupt) when a master mode
collision is detected (NSS is low and MSTEN = 1). This bit is not automatically cleared by
hardware. It must be cleared by software.
Bit4:
RXOVRN: Receive Overrun Flag.
This bit is set to logic 1 by hardware (and generates a SPI interrupt) when the receive buffer
still holds unread data from a previous transfer and the last bit of the current transfer is
shifted into the SPI shift register. This bit is not automatically cleared by hardware. It must
be cleared by software.
Bit3:
TXBSY: Transmit Busy Flag.
This bit is set to logic 1 by hardware while a master mode transfer is in progress. It is
cleared by hardware at the end of the transfer.
Bit2:
SLVSEL: Slave Selected Flag.
This bit is set to logic 1 whenever the NSS pin is low indicating it is enabled as a slave. It is
cleared to logic 0 when NSS is high (slave disabled).
Bit1:
MSTEN: Master Mode Enable.
0: Disable master mode. Operate in slave mode.
1: Enable master mode. Operate as a master.
Bit0:
SPIEN: SPI Enable.
This bit enables/disables the SPI.
0: SPI disabled.
1: SPI enabled.
Rev. 1.6
115