XBee®-PRO 900HP/XSC RF Modules
5
Operation
Basic operational design 35
Serial interface 35
UART data flow 35
Serial data 36
Configuration considerations 36
Select the serial port 36
Force UART operation 37
Select the SPI port 37
Serial port selection 38
Serial receive buffer 38
Serial transmit buffer 38
UART flow control 38
CTS flow control 38
RTS flow control 38
SPI operation
SPI communications 41
SPI implementation 41
SPI signals 42
Full duplex operation 42
Low power operation 43
SPI and API mode 43
SPI parameters 44
Modes
Serial modes 46
Transparent operating mode 46
API operating mode 46
Comparing Transparent and API modes 46
Modes of operation 48
Idle mode 48
Transmit mode 48
Receive mode 48
Command mode 48
Sleep mode 51
Sleep modes
About sleep modes 53
Asynchronous modes 53
Synchronous modes 53
Normal mode 53
Asynchronous pin sleep mode 54
Asynchronous cyclic sleep mode 54
Asynchronous cyclic sleep with pin wake up mode 54
Synchronous sleep support mode 54
Synchronous cyclic sleep mode 55
The sleep timer 55
Indirect messaging and polling 55
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