The Universal Asynchronous
Receiver/Transmitter (UART) module in this device contains the
following features:
- Programmable baud-rate generator allowing speeds of
up to 12.5Mbps for regular speed (divide by 16)
and 25Mbps for high speed (divide by 8)
- Separate
16-level-deep and 8-bit-wide transmit (TX) and
receive (RX) FIFOs to reduce CPU interrupt service
loading
- Programmable FIFO length, including 1-byte-deep
operation providing conventional double-buffered
interface
- FIFO
trigger levels of ⅛, ¼, ½, ¾, and ⅞
- Standard
asynchronous communication bits for start, stop, and
parity
- Line-break generation and detection
- Fully
programmable serial interface characteristics
- 5, 6, 7, or 8 data bits
- Even, odd, stick, or no parity-bit generation and
detection
- 1 or 2 stop-bit generation
- IrDA
serial-IR (SIR) encoder and decoder providing:
- Programmable use of IrDA SIR or UART
input/output
- Support of IrDA SIR encoder and decoder functions
for data rates of up to 115.2Kbps half-duplex
- Support of normal 3/16 and low-power (1.41 to
2.23 μs) bit durations
- Programmable internal clock generator enabling
division of reference clock by 1 to 256 for
low-power-mode bit duration
- EIA-485
9-bit support
- Standard
FIFO-level and End-of-Transmission (EOT)
interrupts
- Efficient
transfers using Micro Direct Memory Access (µDMA)
Controller
- Separate channels for transmit and receive
- Receive single request asserted when data is in
the FIFO; burst request asserted at programmed
FIFO level
- Transmit single request asserted when there is
space in the FIFO; burst request asserted at
programmed FIFO level
Figure 6-109 shows the UART module block diagram.