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SERIAL CONTROL MODULE: UART
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Serial Control Module: UART
CHAPTER 10
The processor ASIC supports four independent universal asynchronous
receiver/transmitter (UART) channels (A through D). Each channel supports several
modes, conditions, and formats.
Features
DMA transfers to and from system memory
Independent receive and transmit programmable bit-rate generators
High speed data transfer up to 1.8432 Mbps
– Programmable data format
5 to 8 data bits
Odd, even, or no parity
1 or 2 stop bits
MSB or LSB first
Programmable channel modes
– Normal
– Local loopback
– Remote loopback
Modem control signal support
– RTS, CTS, DTR, DSR, DCD, RI
Maskable interrupt conditions
– Receiver idle
– Transmitter idle
– Receive error conditions
– Character gap timeout
– Character match events
– CTS, DSR, DCD, RI state change detection
RS485 transceiver control signal
Transmit FIFO bypass to force out a character