HT98R068-1 Two-way Radio OTP MCU
Ex: RX mode, Input = DEMOD, Output = null, Non sub-tone.
Set the DTMF RX Mode Flow
Flow description:
<RSSI OK>: Acknowledge the RF signal is OK.
<81EC3>: Enable the PGA circuit, PGA on – enable the input source PGA.
<81B33>: Select input PGA and audio input source path. Select the PGA input source to
be DEMOD, the audio output to be DAC common-mode bias voltage to reduce noise.
DAO1 and DAO2 are DAC common-mode bias voltage.
<81170>: Enter the TX mode. Select the TX mode and enable the in-band audio = DTMF
function
<Is DTMF event>: Acknowledge that the signal a steady frenquency in the DTM
frequency channel list.
<92F00>: Read the DTMF detection data. Read the frenquency channel of this DTMF
detection data.
<Save DTMF finder>: Store the number after detection. Store this number data
temporarily. After finishing the complete byte data receiving, use it to the application.
<IDLE Mode> Mode>: Enter the IDLE mode. Before the RSSI signal is ok, enter the
waiting mode firstly.
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