Gibson MM516, Руководство пользователя

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MM516
User's Manual
19
Revision 1.4 7-8-2011
Hardware Description Manual
Table 2 UART Settings
The UART interface is capable of resetting BlueCore 5 chip upon reception of a break signal. A break is identified
by a continuous logic low (0V) on the UART_RX terminal, as shown in Figure 5. If t BRK is longer than the value,
defined by PSKEY_HOST_IO_UART_RESET_TIMEOUT, (0x1a4), a reset will occur. This feature allows a host to initialize
the system to a known state. Also, BlueCore 5 chip
can emit a break character that may be used to wake the host.
Figure 5 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 SPI.
Table 3 shows a list of commonly used data rates and their associated values for PSKEY_UART_BAUD_RATE (0x204).
There is no requirement to use these standard values. Any data rate within the supported range can be set in the
PS Key according to the formula
Data Rate = PSKEY_UART_BAUDRATE/0.004096