Digi NS9215 - Manual (Page 433)

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S E R I A L C O N T R O L M O D U L E : S P I
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Serial Control Module: SPI
C H A P T E R 1 2
T
he processor ASIC contains a single high speed, four-wire, serial peripheral
interface (SPI) module.
Features
DMA transfers to and from system memory
Four-wire interface (RXD, TXD, CLK, CS)
Multi-drop supported through GPIO programming
Master or slave operation
High speed data transfer
–
Master: 33.33 Mbps
– Slave: 7.50 Mbps
Programmable MSB/LSB formatting
Programmable SPI mode (0, 1, 2, or 3)
Master mode internal diagnostic loopback
Maskable interrupt conditions
–
Receiver idle
– Transmitter idle