BC68F0031 Datasheet, PDF (88/148 Pages) Holtek Semiconductor Inc – I/O RF Transparent Transmission Flash MCU

BC68F0031
I/O RF Transparent Transmission Flash MCU
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CKEG: SPI SCK clock active edge type selection
CKPOLB = 0
0: SCK is high base level and data capture at SCK rising edge
1: SCK is high base level and data capture at SCK falling edge
CKPOLB = 1
0: SCK is low base level and data capture at SCK falling edge
1: SCK is low base level and data capture at SCK rising edge
The CKEG and CKPOLB bits are used to setup the way that the clock signal outputs
and inputs data on the SPI bus. These two bits must be configured before data transfer
is executed otherwise an erroneous clock edge may be generated. The CKPOLB bit
determines the base condition of the clock line, if the bit is high, then the SCK line
will be low when the clock is inactive. When the CKPOLB bit is low, then the SCK
line will be high when the clock is inactive. The CKEG bit determines active clock
edge type which depends upon the condition of CKPOLB bit.
MLS: SPI bus data shift order
0: LSB first
1: MSB first
This is the data shift select bit and is used to select how the data is transferred, either
MSB or LSB first. Setting the bit high will select MSB first and low for LSB first.
CSEN: SPI SCS pin control
0: Disable
1: Enable
The CSEN bit is used as an enable/disable for the SCS pin. If this bit is low, then the
SCS pin function will be disabled and can be placed into I/O pin or other pin-shared
functions. If the bit is high, the SCS pin will be enabled and used as a select pin.
WCOL: SPI write collision flag
0: No collision
1: Collision
The WCOL flag is used to detect whether a data collision has occurred or not. If this
bit is high, it means that data has been attempted to be written to the SPID register
duting a data transfer operation. This writing operation will be ignored if data is being
transferred. This bit can be cleared by the application program.
TRF: SPI Transmit/Receive complete flag
0: SPI data is being transferred
1: SPI data transfer is completed
The TRF bit is the Transmit/Receive Complete flag and is set to 1 automatically when
an SPI data transfer is completed, but must cleared to 0 by the application program. It
can be used to generate an interrupt.
Rev. 1.01
88
April 11, 2017