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Use External Control Flow
Flow description:
<PLL setting ...>: Enable and setup the PLL.
<Audio processor ...>: Reset the audio processor.
<Control Signal status>: Check the control signal status and select the SPI path to be
external or internal.
<SPICR[7]=0 or =1>: Execute the MCU SPI external/internal control bit configuration.
<External or Internal MCU control flow>: Execute the internal/external MCU system
flow.
IDLE/SLOW/TX/RX Mode Select Setup
When applied to a radio walkie talkie application, the ON/OFF circuit and function for
different modes are different, as well as the ON/OFF timing. Switch to the correct input or
output source and disable any unnecessary circuits so as to save power and eliminate
interference among signals. This part is part is in the I/O command making signal control
easier. The following describes the three mode setups (see SLOW Mode in VOX):
IDLE Mode
When the audio processor is not processing data, entering this mode can save power,
however the quantity depends on the actual practical situation. The device provides many
ways to enter the idle mode - see the datasheet. Here we use the simplest method. The
I/O CMD-51h bit can control the audio processor operation - Stop/Operate: FAh/F8h.
Disable the audio processor clock when no event is happening, then use the MCU to
detect the external signals, and enable the audio processor after the signal is identified as
shown below.
HT98R068 Two-way Radio MCU
12
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