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Si4464/63/61/60
3.2. Fast Response Registers
The fast response registers are registers that can be read immediately without the requirement to monitor and
check CTS. There are four fast response registers that can be programmed for a specific function. The fast
response registers can be read through API commands, 0x50 for Fast Response A, 0x51 for Fast Response B,
0x53 for Fast Response C, and 0x57 for Fast Response D. The fast response registers can be configured by the
“FRR_CTL_X_MODE” properties.
The fast response registers may be read in a burst fashion. After the initial 16 clock cycles, each additional eight
clock cycles will clock out the contents of the next fast response register in a circular fashion. The value of the
FRRs will not be updated unless NSEL is toggled.
3.3. Operating Modes and Timing
The primary states of the Si446x are shown in Figure 6. The shutdown state completely shuts down the radio to
minimize current consumption. Standby/Sleep, SPI Active, Ready, TX Tune, and RX tune are available to optimize
the current consumption and response time to RX/TX for a given application. API commands START_RX,
START_TX, and CHANGE_STATE control the operating state with the exception of shutdown which is controlled
by SDN, pin 1. Table 9 shows each of the operating modes with the time required to reach either RX or TX mode as
well as the current consumption of each mode. The times in Table 9 are measured from the rising edge of nSEL
until the chip is in the desired state. Note that these times are indicative of state transition timing but are not
guaranteed and should only be used as a reference data point. An automatic sequencer will put the chip into RX or
TX from any state. It is not necessary to manually step through the states. To simplify the diagram it is not shown
but any of the lower power states can be returned to automatically after RX or TX.
Figure 6. State Machine Diagram
Rev 1.2
19
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