2.5 External Configuration

The BM20/23 stereo module can be configured and the firmware programmed using an external configuration and programming tool available from Microchip. The following figure illustrates the configuration and firmware programming interface on BM23. It is recommended to include a pin header on the main PCB for development.

Figure 2-12. External Programming Header Connections

Configuration and firmware programming modes are entered according to the system configuration I/O pins as shown in the following table. Pins P20, P24 and EAN contain internal pull-up.

Table 2-1. System Configuration Settings
P20	P24	EAN	Operational Mode
High	High	High	APP mode (Normal operation)
Low	High	High	APP mode (Normal operation)
Low	Low	High	Write Flash (Firmware programming, if flash build-in in chip)