CP3BT23_14 Datasheet, PDF (101/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
www.ti.com
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
Fast-Write Operation
An enhanced serial interface mode including fast write capability is enabled when the FW bit in the radio
chip is set. This bit activates a mode with decreased addressing and control overhead, which allows fast
loading of time-critical registers during normal operation. When the FW bit is set, the 3-bit header may
have a value other than 101b, and it is used to address the write-only registers of the radio chip. Fast
writes load the same physical register as the corresponding normal write operation.
For the power control and CMOS output registers of the RF chip, it is only necessary to transmit a total of
8 bits (3 address bits and 5 data bits), because the remaining eight bits are unused.
While the FW bit is set, normal Read/Write operations are still valid and may be used to access non-time-
critical control registers. Figure 15-5 shows the timing for a 16-bit Fast-Write transaction, and Figure 15-6
shows the timing for an 8bit Fast-Write transaction.
Figure 15-5. Serial Interface 16-bit Fast-Write Timing
Figure 15-6. Serial Interface 8-bit Fast-Write Timing
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