[VIP第3年] 指数:1
• 7, 8, or 9 data bits and 1 or 2 stop bits
• Synchronous mode with master or slave operation. Includes data phase selection and
continuous clock option.
• Multiprocessor/multidrop (9-bit) mode with software address compare. (RS-485
possible with software address detection and transceiver direction control.)
• Parity generation and checking: odd, even, or none.
• One transmit and one receive data buffer.
• RTS/CTS for hardware signaling for automatic flow control. Software flow control can
be performed using Delta CTS detect, Transmit Disable control, and any GPIO as an
RTS output.
• Received data and status can optionally be read from a single register
• Break generation and detection.
• Receive data is 2 of 3 sample "voting". Status flag set when one sample differs.
• Built-in Baud Rate Generator.
• A fractional rate divider is shared among all UARTs.
• Interrupts available for Receiver Ready, Transmitter Ready, Receiver Idle, change in
receiver break detect, Framing error, Parity error, Overrun, Underrun, Delta CTS
detect, and receiver sample noise detected.
• Separate data and flow control loopback modes for testing.
• Baud rate clock can also be output in asynchronous mode.
• Supported by on-chip ROM API.
8.14 SPI0/1
All SPI functions are movable functions and are assigned to pins through the switch
matrix.
8.14.1 Features
• Maximum data rates of up to 30 Mbit/s in master mode and up to 18 Mbit/s in slave
mode for SPI functions connected to all digital pins except the open-drain pins.
• Data frames of 1 to 16 bits supported directly. Larger frames supported by software.
• Master and slave operation.
• Data can be transmitted to a slave without the need to read incoming data, which can
be useful while setting up an SPI memory.
• Control information can optionally be written along with data, which allows very
versatile operation, including “any length” frames.
• One Slave Select input/output with selectable polarity and flexible usage.
Remark: Texas Instruments SSI and National Microwire modes are not supported.
8.15 I2C-bus interface (I2C0/1/2/3)
The I2C-bus is bidirectional for inter-IC control using only two wires: a serial clock line
(SCL) and a serial data line (SDA). Each device is recognized by a unique address and
can operate as either a receiver-only device (e.g., an LCD driver) or a transmitter with the
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