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Audio processor turn on/off using SPI command flow
Flow description:
When there is no output and the input signals are waiting to be processed, the audio
processor can be disabled. After waiting immediate operating can be restarted without
needing to re-initialise.
<851F8>: Enable the audio processor clock.
<851FA>: Disable the audio processor clock.
TX Mode
Enter the Tx mode according to the input data trigger, such as pressing PTT, audio signal
(VOX)...etc. The mode switches, input source selection, circuit disabling etc. will be
generally executed in this mode. As for the audio buffer input source, it is recommended
to switch to bias to reduce noise, or turn off the buffer (I/O CMD-1Eh[3]), or even choose
both. During Tx/Rx switching, it is recommended to execute a circuit ON/OFF, path select
and mode switch so as to decrease the generation of error signals. The following
flowchart illustrates the PTT processing:
Ex: Setup the TX mode, Input = MIC, Output = MOD, No sub-tones
Tx mode Setup Flow
HT98R068 Two-way Radio MCU
13
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