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CC11019 Configuration SoftwareCC1101 can be configured using the SmartRF ®Studio software [7]. The SmartRF ® Studiosoftware is highly recommended for obtainingoptimum register settings, and for evaluatingperformance and functionality. A screenshot ofthe SmartRF ® Studio user interface for CC1101is shown in Figure 6.After chip reset, all the registers have defaultvalues as shown in the tables in Section 33.The optimum register setting might differ fromthe default value. After a reset all registers thatshall be different from the default valuetherefore needs to be programmed throughthe SPI interface.Figure 6: SmartRF ® Studio [7] User Interface10 4-wire Serial Configuration and Data InterfaceCC1101 is configured via a simple 4-wire SPIcompatibleinterface (SI, SO, SCLK and CSn)where CC1101 is the slave. This interface isalso used to read and write buffered data. Alltransfers on the SPI interface are done mostsignificant bit first.All transactions on the SPI interface start witha header byte containing a R/W¯ bit, a burstaccess bit (B), and a 6-bit address (A 5 – A 0 ).The CSn pin must be kept low during transferson the SPI bus. If CSn goes high during thetransfer of a header byte or during read/writefrom/to a register, the transfer will becancelled. The timing for the address and datatransfer on the SPI interface is shown in Figure7 with reference to Table 16.When CSn is pulled low, the MCU must waituntil CC1101 SO pin goes low before starting toSWRS061C Page 23 of 94