User Manual

Bluegiga Proprietary Version 1.0

The UART interface is capable of resetting WRAP THOR 2022-1 upon reception of a break signal.

A Break is identified by a continuous logic low on the UART_RX terminal, as shown in figure

9.16. If tBRK is longer than the value, defined by the Persistent Store Key

PSKEY_HOST_IO_UART_RESET_TIMEOUT, (0x1a4), a reset will occur. This feature allows a

host to initialise the system to a known state. Also, WRAP THOR 2022-1 can emit a Break

character that may be used to wake the Host.

Figure 7: Break signal

Note:

The DFU boot-loader must be loaded into the Flash device before the UART or USB interfaces can

be used.

This initial Flash programming can be done via the serial peripheral interface. Table 9.10 shows a

list of commonly used Baud rates and their associated values for the Persistent Store Key

PSKEY_UART_BAUD_RATE (0x204). There is no requirement to use these standard values any

Baud rate within the supported range (see Table 9.8) can be set in the Persistent Store Key

according to the following formula.

Table 7: Standard Baud Rates