Theory of Operation: Bluetooth 3-57
The ATMEL bootloader is being used as a first stage bootloader that will jump to the Motorola
bootloader, which is a stage two bootloader. GPIO20 is used by the ATMEL bootloader to trap in
Flash mode. GPIO19 will be used by the Motorola bootloader to trap in Flash mode. Both pins are
active low.
The Bluetooth audio is sent over a two-channel PCM/SSI interface to the audio codec (U6405) on
the Main board.
Table 3-15. GPIO I/O
Signal Name Pad Name GPIO Schematic Name I/O
GPIO41 PB09 41 BT_HOST_WAKEUP_3.3V I
GPIO49 PB17 49 BT_PTT_3.3V O
GPIO50 PB18 50 BT_SHUTDOWN_3.3V O
GPIO51 PB19 51 BT_WAKEUP_3.3V O
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