S/AI
Hardware Reference
Page 18 of 52
3.7 SPI Serial Peripheral Interface
The serial peripheral interface (SPI) allows for full-duplex, synchronous, serial communication with
external devices. The interface can be configured as the
master
and then provides the
communication clock (SCK) to the external slave device(s), or as the
slave
. The SPI Interface
supports SPI-modes 0 through 3. Module pins are used as follows:
•
GPIO[2]: SPI-MOSI
•
GPIO[5]: SPI-MISO
•
GPIO[8]: SPI-SCK
GPIO[8]/SPI-SCK
GPIO[2]/SPI-MOSI
S
E-2
SPI-Master
connected device
SPI-Slave
GPIO[5]/SPI-MISO
D-1
F-2
SCK, SPI_CLK
SDI, MOSI
SDO, MISO
typical signals:
Figure 8: S SPI Interface (Example: Master Mode)
3.8 Bluetooth Radio Interface
The S/AI presents an integrated ceramic antenna.
It is highly recommended that you follow the design rule given in the Stollmann Application Note on
Antenna design [4].
2
subject to firmware support, contact Stollmann for current status
