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STA680 Datasheet(PDF) 27 Page - STMicroelectronics

No. de pieza STA680
Descripción Electrónicos  Automotive HD Radio™ baseband receiver
PDF  48 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA680 Datasheet(HTML) 27 Page - STMicroelectronics

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DS5877 Rev 13
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STA680
Power supply ramp-up phase
47
Once the source of the secondary boot code has been identified, the STA680 executes the
following steps:
1.
code authentication
2.
SDRAM initialization
3.
secondary boot code download to SDRAM.
In order to decrease the boot time during the secondary phase, the STA680 performs the
setup of the PLLs and sets the internal clock frequency to 28.224 MHz (see Figure 7).
Subsequently it downloads and validates the application code either from the external Flash
memory or from the host microcontroller. This ends the boot procedure.
4.3
Normal operation mode
After the execution of the boot code, the device enters the normal operation mode by
jumping to the main program loop.



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