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TMS320VC5470ZHKA Datasheet(PDF) 41 Page - Texas Instruments |
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TMS320VC5470ZHKA Datasheet(HTML) 41 Page - Texas Instruments |
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41 / 94 page  MCU Subsystem Functional Overview 32 December 2001 − Revised December 2002 SPRS017B 4.3 MCU Peripherals The following section describes the 5470 MCU subsystem peripherals. 4.3.1 MCU Universal Asynchronous Receiver/Transmitter (UART) Interfaces The UART modules perform serial-to-parallel conversion on data characters received and parallel-to-serial conversion on data characters transmitted by the processor. 4.3.1.1 UART Modes UART mode supports data transmission and data reception via two 64-word-deep FIFOs. Five different parity types are enabled, with three different stop bit formats. The word length is between 5 and 8, and line break can be generated and detected. The baud rate is generated from the MCU subsystem clock by a programmable divisor. All transmitting parameters can be detected in reception mode by an auto-bauding mechanism that recognizes speed, word size, parity, and the number of stop bits. Software flow control is available in the UART/IrDA when in UART mode. The UART/modem supports both software and hardware flow control when in UART mode. Hardware flow control can reduce the MCU software overhead required to process data interrupts. UART/Modem Mode The UART/modem provides an autobauding mechanism. All operations are controllable either via a software interface or using hardware flow control signals. The UART/Modem provides five external pin signals (multiplexed with GPIO pins): • GPIO09/TX_MODEM: Output - transmit data • GPIO10/RX_MODEM: Input - receive data • GPIO11/CTS_MODEM: Input - clear to send • GPIO12/RTS_MODEM: Output - request to send • GPIO13/DCD_MODEM: Output - data carrier detected The UART/modem features: • Line-break generation and detection • Interrupt system control • Loop-back capabilities for internal test • The autobauding supports speeds between 1200 and 115.2 Kbits/s. • Hardware flow control (DCD, RTS, CTS) UART/IrDA Mode In the UART/IrDA mode, an Infrared Data Association (IrDA) protocol encoder/decoder manages the RXIR and TXIR signals to an IrDA transceiver. It includes the slow infrared (SIR) protocol in order to be connected with an infrared transmitter to any external data peripherals with an IrDA compliant data interface. The UART/IrDA provides three external pin signals (multiplexed with GPIO pins): • GPIO07/TX_IRDA/TXIR_IRDA: Output – transmit data • GPIO08/RX_IRDA/RXIR_IRDA: Input – receive data • GPIO06/CLK16X_IRDA/SD_IRDA: Output – shut down the IR transceiver |
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