Table 3-15. Gpio I/O - Motorola APX 3000 Detailed Service Manual

Theory of Operation
: Bluetooth
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.
Signal Name
GPIO41
GPIO49
GPIO50
GPIO51

Table 3-15. GPIO I/O

Pad Name GPIO
PB09 41
PB17 49
PB18 50
PB19 51
Schematic Name
BT_HOST_WAKEUP_3.3V
BT_PTT_3.3V
BT_SHUTDOWN_3.3V
BT_WAKEUP_3.3V
3-57
I/O
I
O
O
O