RFM22
Figure 3. SPI Timing—READ Mode
The SPI interface contains a burst read/write mode which will allows for reading/writing sequential registers without
having to re-send the SPI address. When the nSEL bit is held low while continuing to send SCLK pulses, the SPI
interface will automatically increment the ADDR and read from/write to the next address. An SPI burst write
transaction is demonstrated in Figure 4 and burst read in Figure 3. As long as nSEL is held low, input data will be
latched into the RFM22 every eight SCLK cycles. A burst read transaction is also demonstrated in Figure 5.
Figure 4. SPI Timing—Burst Write Mode
Figure 5. SPI Timing—Burst Read Mode
15
Tel: +86-755-82973805
Fax: +86-755-82973550
E-mail: sales@hoperf.com
http://www.hoperf.com
HOPERF [ HOPERF ]
