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In doze mode, the UART behavior depends on the DOZE control bit. While the DOZE
bit is cleared, the UART serial interface is unaffected. While the system is in doze
mode, and the DOZE bit is set, the UART is disabled. If the doze mode is entered with
the DOZE bit set while the UART serial interface was receiving or transmitting data, it
will finish receiving or transmitting the current character and signal to the far-end
transmitter or receiver to stop sending or receiving. There is no guarantee that the
data currently present in the receiver and transmitter FIFOs will not be corrupted.
11.8 UART Operation in System Debug Mode
In debug mode, reads of the UART receiver register do not cause the RX FIFO to
"bump." That is, the value at the read side of the RX FIFO does not change as a result
of reading this register in debug mode. Repeated reads of the UART receiver register,
therefore, do not cause its value to change once it contains a valid character.
MOTOROLA
UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER MODULE
11-24
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MMC2001
REFERENCE MANUAL
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