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(3): Enable and output the Audio_out signal:
Flow description (1):
<RSSI OK>：Confirm the RF signal is OK.
<81EC3>：Enable the PGA circuit. PGA on - enable the PGA input source.
<81B30>：Select the PGA and Audio input source paths. Select the PGA input source to
be DEMOD and audio out to be DAC common-mode bias to reduce noise.
<81161> Enter the Rx mode. Select the Rx mode and enable the Sub-tone = DCS
function.
Flow description (2):
<Is Data = 10004>：Confirm the interrupt is the DCS sub-tone signal of the same channel.
<92300>：Check again the event status, which can be shared with the 23h status
management program.
Flow description (3):
<Is DCS event>：Wait to check whether this signal contains the DCS sub-tone of the
same channel.
<81E8B>： Enable the DAC1, Buffer, PGA circuits. DAC1 on - enable the DAC1 output.
AUDO output buffer on–enable the audio output circuit. PGA on–enable the PGA input
source.
<81B25>：Select the PGA and Audio input source paths. Select the PGA input source to
be DEMOD, Audio out sources to be DAC1 and switch the DAC1 pin source paths to the
internal common-mode bias in order to avoid the audio leaking from MOD.
HT98R068 Two-way Radio MCU
21
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