ADF7242 SPI status word became 0xA0 or 0xFF, some reserved status，and write RC_RESET command can't make the status right. How make it in right status ?
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It is probably a timing issue. There is a required 2 ms CS high time on wake-up or after RC_RESET or RC_SLEEP command (see datasheet Table 9 and Figure 5 and Figure 70 - 26 MHz crystal with 10 pF load).
Then you can pull CS low and must wait until MISO goes high before writing to the SPI
Retrieving data ...