si4420 Silicon Laboratories, si4420 Datasheet - Page 23

• Manufacturer Part Number: si4420
• Description: Si4420 Universal Ism Band Fsk Transceiver
• Manufacturer: Silicon Laboratories

Si4420
TX REGISTER BUFFERED DATA TRANSMISSION
In this operating mode (enabled by bit el, the Configuration Control Command) the TX data is clocked into one of the two 8-bit data registers.
The transmitter starts to send out the data from the first register (with the given bit rate) when bit et is set with the Power Management
Command. The initial value of the data registers (AAh) can be used to generate preamble. During this mode, the SDO pin can be monitored
to check whether the register is ready (SDO is high) to receive the next byte from the microcontroller.
TX Register Simplified Block Diagram (Before Transmit)
TX Register Simplified Block Diagram (During Transmit)
Typical TX Register Usage
Note:
The content of the data registers are initialized by clearing bit et.
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