SPI Pins Configuration
After SPI is enabled SUB-20 SPI module will take control over SPI pins.
Pin |
Function |
Master mode |
Slave mode |
Disabled |
SCK |
SPI Master Clock |
Output |
Input |
HiZ |
MOSI |
Master Out Slave In |
Output |
Input |
|
MISO |
Master In Slave Out |
Input |
Output** |
|
SS0 |
Slave Select 0 |
Output Hi (Configurable by sub_spi_transfer) |
Input |
|
SS1 SS2 SS3 SS4 |
Slave Select 1..4 |
HiZ (Configurable by sub_spi_transfer) |
Not in use |
*If SPI is disabled all SPI pins are in HiZ.
** In SPI slave mode MISO is output only when SS0 is low
SPI SCK Polarity and Phase explanations
|
SPI Transfer format with SPI_SMPL_SETUP |
SPI_CPOL_RISE
SPI_CPOL_FALL
Sample
MOSI Pin
MISO Pin
|
|
|
SPI Transfer format with SPI_SETUP_SMPL |
SPI_CPOL_RISE
SPI_CPOL_FALL
Sample
MOSI Pin
MISO Pin
|
|
Functions