Digi XBee SX - Serial Communication

Serial communication
UART data flow 59
SPI signals 59
Slave mode characteristics 60
Full duplex operation 61
Low power operation 61
Configuration considerations 62
SPI and API mode 62
SPI parameters 62
Serial port selection 62
UART flow control 63
XBee®/XBee-PRO SX RF Module User Guide
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