5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 64-byte FIFOs and 68 mode uP interfac
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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 TXRDYn/RXRDYn 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 TXn signal and receives characters on the RXn 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.
製品詳細
Features
Key Features
- Dual channel with 68 mode (Motorola) µP 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
- 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 on input only pins1
- Software selectable baud rate generator
- Prescaler provides additional divide-by-4 function
- Industrial temperature range (-40 ℃ to +85 ℃)
- Fast data bus access time
- Programmable Sleep mode
- 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)
Software/Hardware Flow Control
- Programmable Xon/Xoff characters
- Programmable auto-RTS and auto-CTS
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