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SC28L198A1A Datasheet(PDF) 2 Page - NXP Semiconductors |
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SC28L198A1A Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 56 page  Philips Semiconductors Product specification SC28L198 Octal UART for 3.3V and 5V supply voltage 2 1999 Jan 14 853–2047 20654 Table of Contents Description 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Uses 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin Configurations 4 . . . . . . . . . . . . . . . . . . . . . . . . . Pinout 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin Description 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Absolute Maximum Ratings 6 . . . . . . . . . . . . . . . . . Block Diagram 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description 7 . . . . . . . . . . . . . . . . . . . . . Conceptual Overview 7 . . . . . . . . . . . . . . . . . . . . . . . Host Interface 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Asynchronous bus cycle 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . Synchronous bus cycle 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Timing Circuits 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Crystal Oscillator 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sclk – System Clock 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baud Rate Generator BRG 8 . . . . . . . . . . . . . . . . . . . . . . . . BRG Counters (Used for random baud rate generation) 8 Channel Blocks 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Character Recognition 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Control 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Global Registers 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Ports 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detailed Descriptions 9 . . . . . . . . . . . . . . . . . . . . . . . Receiver and Transmitter 9 . . . . . . . . . . . . . . . . . . . Transmitter 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Bits 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmission of ”break” 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1x and 16x modes, Transmitter 10 . . . . . . . . . . . . . . . . . . . . . Transmitter FIFO 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1x and 16x mode, Receiver 10 . . . . . . . . . . . . . . . . . . . . . . . . . Receiver Status Bits 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver FIFO 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RxFIFO Status: Status reporting modes 11 . . . . . . . . . . . . . . I/O ports 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Purpose Pins 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Global Registers 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Character Recognition 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Xon Xoff Characters 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multi-drop or Wake up or 9 bit mode 12 . . . . . . . . . . . . . . . . . Character Stripping 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt Arbitration and IRQN generation 12 . . . . . . . . . . . . . . . . IACKN Cycle, Update CIR 13 . . . . . . . . . . . . . . . . . . . . . . . . . . Polling 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enabling and Activating Interrupt sources 13 . . . . . . . . . . . . . Setting Interrupt Priorities 13 . . . . . . . . . . . . . . . . . . . . . . . . . . Modes of Operation 14 . . . . . . . . . . . . . . . . . . . . . . . . Major Modes 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Minor Modes 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Watch-dog Timer Time–out Mode 15 . . . . . . . . . . . . . . . . . . . Wake Up Mode 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Xon/Xoff Operation 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . REGISTER DEFINITIONS 18 . . . . . . . . . . . . . . . . . . . . MR – Mode Registers 18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UCIR – Update CIR 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Purpose Output Pin Control 30 . . . . . . . . Register Maps 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Register Map Summary 31 . . . . . . . . . . . . . . . . . . . . . Register Map Detail 32 . . . . . . . . . . . . . . . . . . . . . . . . Reset Conditions 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . Device Configuration after Hardware Reset or CRa cmd=x1F 41 Cleared registers: 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clears Modes for: 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Disables: 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Halts: 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Limitations: 41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC Electrical Specifications (5V) 42 . . . . . . . . . . . . AC Electrical Characteristic (5V) 43 . . . . . . . . . . . . DC Electrical Specifications (3.3V) 45 . . . . . . . . . . AC Electrical Characteristics (3.3V) 46 . . . . . . . . . . INDEX 52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DESCRIPTION The Philips 28L198 Octal UART is a single chip CMOS–LSI communications device that provides 8 full-duplex asynchronous channels with significantly deeper 16 byte FIFOs, Automatic in–band flow control using Xon/Xoff characters defined by the user and address recognition in the wake up mode. Synchronous bus interface is used for all communication between host and OCTART. It is fabricated using Philips 1.0 micron CMOS technology that combines the benefits of low cost, high density and low power consumption. The operating speed of each receiver and transmitter can be selected independently from one of 22 fixed baud rates, a 16X clock derived from one of two programmable baud rate counters or one of three external 16X clocks (1 available at 1x clock rate). The baud rate generator and counter can operate directly from a crystal or from seven other external or internal clock inputs. The ability to independently program the operating speed of the receiver and transmitter makes the Octal UART particularly attractive for dual speed full duplex channel applications such as clustered terminal systems. The receivers and transmitters are buffered with FIFOs of 16 characters to minimize the potential for receiver overrun and to reduce interrupt overhead. In addition, a handshaking capability and in–band flow control are provided to disable a remote UART transmitter when the receiver buffer is full or nearly so. To minimize interrupt overhead an interrupt arbitration system is included which reports the context of the interrupting UART via direct access or through the modification of the interrupt vector. The context of the interrupt is reported as channel number, type of device interrupting ( receiver COS etc.) and, for transmitters or receivers, the fill level of the FIFO. The Octal UART provides a power down mode in which the oscillator is stopped but the register contents are maintained. This results in reduced power consumption of several orders of magnitudes. The Octal UART is fully TTL compatible when operating from a single +5V power supply. Operation at 3.3 volts is maintained with CMOS interface levels. The device also offered in a version which maintains TTL input and output levels while operating with a 3.3 volt power supply. |
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