SC68C752B

General description

The SC68C752B is a dual Universal Asynchronous Receiver/Transmitter (UART) with 64-byte FIFOs, automatic hardware/software flow control, and data rates up to 5 Mbit/s. The SC68C752B offers enhanced features. It has a Transmission Control Register (TCR) that stores receiver FIFO threshold levels to start/stop transmission during hardware and software flow control. With the FIFO Rdy register, the software gets the status of TXRDY/RXRDY for all four ports in one access. On-chip status registers provide the user with error indications, operational status, and modem interface control. System interrupts may be tailored to meet user requirements. An internal loopback capability allows on-board diagnostics.

The UART transmits data, sent to it over the peripheral 8-bit bus, on the TX signal and receives characters on the RX signal. Characters can be programmed to be 5 bits, 6 bits, 7 bits, or 8 bits. The UART has a 64-byte receive FIFO and transmit FIFO and can be programmed to interrupt at different trigger levels. The UART generates its own desired baud rate based upon a programmable divisor and its input clock. It can transmit even, odd, or no parity and 1, 1.5, or 2 stop bits. The receiver can detect break, idle, or framing errors, FIFO overflow, and parity errors. The transmitter can detect FIFO underflow. The UART also contains a software interface for modem control operations, and has software flow control and hardware flow control capabilities.

The SC68C752B is available in LQFP48 and HVQFN32 packages.

Features

• Dual channel with Motorola uP interface
• Up to 5 Mbit/s data rate
• 64-byte transmit FIFO
• 64-byte receive FIFO with error flags
• Programmable and selectable transmit and receive FIFO trigger levels for DMA and interrupt generation
• Software/hardware flow control
• Programmable Xon/Xoff characters
• Programmable Auto-RTS and Auto-CTS
• Optional data flow resume by Xon any character
• DMA signalling capability for both received and transmitted data
• Supports 5 V, 3.3 V and 2.5 V operation
• 5 V tolerant inputs
• Software selectable baud rate generator
• Prescaler provides additional divide-by-4 function
• Industrial temperature range (-40 Cel to +85 Cel)
• Fast data bus access time
• Programmable Sleep mode
• Programmable serial interface characteristics
• 5-bit, 6-bit, 7-bit, or 8-bit characters
• Even, odd, or no parity bit generation and detection
• 1, 1.5, or 2 stop bit generation
• False start bit detection
• Complete status reporting capabilities in both normal and Sleep mode
• Line break generation and detection
• Internal test and loopback capabilities
• Fully prioritized interrupt system controls
• Modem control functions (CTS, RTS, DSR, DTR, RI, and CD)

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

Related applications
LCD TV - MMS functionality
Set-top box - MMS functionality

Block diagrams/pinning

Design support

Application Notes

AN10353; Application of UART in GPS navigation system (2005-03-01)

AN10307; UART to Bluetooth interfacing (2004-08-11)

Support Documents

web; IBIS and HSPICE Model ()

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer