Holtek BA45F56 Series Function Description page 6

Step 8. Wait for data transmit/receive operation to complete: Determine whether T/RXCMPIF is 1.
Step 9. Read the FIFO data: Use the SPI command RX FIFO Read Command (0x91) to read the
received data from the FIFO. If data is to be transmitted do not execute this step. For the
TX and RX related timing diagram refer to the datasheet.
After enabling transmit/receive (Step 7) the complete state switching flow is shown in Figure 4.
Here the Idle Mode can force the RF to use the internal low-frequency oscillator which will
effectively reduce the wake-up time. The following modes must be executed using the process
sequence of this state switching diagram. For example, after entering the Idle Mode, it is necessary
to return to the Light Sleep Mode, after which jump to the Standby Mode and then execute the TX
or RX program.
Auto (TX completed)/
The FIFO Mode is divided into the Block FIFO Mode, Extern FIFO Mode and Infinite FIFO
Mode. For other modes of operation, refer to the datasheet.
AN0571EN V1.00
BA45F56xx Wireless Transceiver Application
Deep Sleep
Idle
Idle
Idle
Light Sleep
Light Sleep
TX/(Auto)
TX
Fig.4 FIFO Mode State Diagram
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Power Down
Power On
Deep Sleep
Deep Light
Calibration
Sleep Sleep
enabled
Auto (calibration completed)
Light Sleep
Standby/
RX/TX(~35μs)
Standby
RX/(Auto)
RX
Calibrations
Auto (RX completed)/
Light Sleep
November 5, 2020