2.3 Generic Interface (PT-1202 only)

The 40-pin connector is not populated, the X3 connector is populated with the pin header. Selection over the jumpers is not possible. The interface to the host system is on X3 with the following pin assignments:

Pin #Usage
3SPI: MOSI (Master-Out-Slave-In)
4SPI: MISO (Master-In-Slave-Out)
5SPI: CLK (Clock)
6IRQ (Interrupt to host)
7SPI: CS (Chip Select/Chip Enable)

The crossed-out pins are not used in this configuration.

For the SPI interface, the Raspberry Pi acts as “master”, the IOL HAT as “slave”. The SPI mode is Mode 0 (CPOL=0; CPHA=0).