ZHCSKJ6 December   2019 TL16C750E

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     方框图
  4. 4 修订历史记录
  5. 5 说明 （续）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. Table 1. Absolute Maximum Ratings
    2. 7.1      ESD Ratings
    3. Table 2. Recommended Operating Conditions
    4. Table 3. Thermal Information
    5. Table 4. Electrical Characteristics
    6. Table 5. Timing Requirements
    7. 7.2      Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Feature Description
      1. 9.3.1  UART Modes
      2. 9.3.2  Trigger Levels
      3. 9.3.3  Hardware Flow Control
      4. 9.3.4  Auto-RTS
      5. 9.3.5  Auto-CTS
      6. 9.3.6  Software Flow Control
      7. 9.3.7  Software Flow Control Example
      8. 9.3.8  Reset
      9. 9.3.9  Interrupts
      10. 9.3.10 Interrupt Mode Operation
      11. 9.3.11 Polled Mode Operation
      12. 9.3.12 Break and Timeout Conditions
      13. 9.3.13 Programmable Baud Rate Generator with Fractional Divisor
      14. 9.3.14 Fractional Divisor
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device Interface Mode
        1. 9.4.1.1 IOR Used (MODE = VCC)
        2. 9.4.1.2 IOR Unused (MODE = GND)
      2. 9.4.2 DMA Signaling
        1. 9.4.2.1 Single DMA Transfers (DMA Mode 0 or FIFO Disable)
        2. 9.4.2.2 Block DMA Transfers (DMA Mode 1)
      3. 9.4.3 Sleep Mode
    5. 9.5 Register Maps
      1. 9.5.1  Registers Operations
      2. 9.5.2  Receiver Holding Register (RHR)
      3. 9.5.3  Transmit Holding Register (THR)
      4. 9.5.4  FIFO Control Register (FCR)
      5. 9.5.5  Line Control Register (LCR)
      6. 9.5.6  Line Status Register (LSR)
      7. 9.5.7  Modem Control Register (MCR)
      8. 9.5.8  Modem Status Register (MSR)
      9. 9.5.9  Interrupt Enable Register (IER)
      10. 9.5.10 Interrupt Identification Register (IIR)
      11. 9.5.11 Enhanced Feature Register (EFR)
      12. 9.5.12 Divisor Latches (DLL, DLH, DLF)
      13. 9.5.13 Transmission Control Register (TCR)
      14. 9.5.14 Trigger Level Register (TLR)
      15. 9.5.15 FIFO Ready Register
      16. 9.5.16 Alternate Function Register (AFR)
      17. 9.5.17 RS-485 Mode
      18. 9.5.18 IrDA Overview
      19. 9.5.19 IrDA Encoder Function
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Set the desired baud rate
        2. 10.2.2.2 Reset the fifos
        3. 10.2.2.3 Sending data on the bus
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Examples
  13. 13器件和文档支持
    1. 13.1 文档支持
      1. 13.1.1 相关文档
    2. 13.2 接收文档更新通知
    3. 13.3 支持资源
    4. 13.4 商标
    5. 13.5 静电放电警告
    6. 13.6 Glossary
  14. 14机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

9.3.9 Interrupts

The TL16C750E UART has interrupt generation and prioritization (six prioritized levels of interrupts) capability. The interrupt enable register (IER) enables each of the six types of interrupts and the INT signal in response to an interrupt generation. The IER also can disable the interrupt system by clearing bits 0 to 3, 5 to 7. When an interrupt is generated, the interrupt identification register (IIR) indicates that an interrupt is pending and provides the type of interrupt through IIR[5−0]. Table 9 summarizes the interrupt control functions.

Table 9. Interrupt Control Functions

IIR[5–0] PRIORITY LEVEL INTERRUPT TYPE INTERRUPT SOURCE INTERRUPT RESET METHOD
000001 None None None None
000110 1 Receiver line status OE, FE, PE, or BI errors occur in characters in the RX FIFO FE < PE < BI: All erroneous characters are read from the RX FIFO. OE: Read LSR
001100 2 RX timeout Stale data in RX FIFO Read RHR
000100 2 RHR interrupt DRDY (data ready)
(FIFO disable)
RX FIFO above trigger level (FIFO enable)		 Read RHR
000010 3 THR interrupt TFE (THR empty)
(FIFO disable)
TX FIFO passes above trigger level (FIFO enable)		 Read IIR or a write to the THR
001000 4 Modem status MSR[3:0] != 0 Read MSR
010000 5 Xoff interrupt Receive Xoff character or characters/special character Receive Xon character or characters/Read of IIR
100000 6 CTS, RTS RTS pin or CTS pin change state from active (low) to inactive (high) Read IIR

It is important to note that for the framing error, parity error, and break conditions, LSR[7] generates the interrupt. LSR[7] is set when there is an error anywhere in the RX FIFO and is cleared only when there are no more errors remaining in the FIFO. LSR[4–2] always represent the error status for the received character at the top of the RX FIFO. Reading the RX FIFO updates LSR[4–2] to the appropriate status for the new character at the top of the FIFO. If the RX FIFO is empty, then LSR[4–2] is all 0.

For the Xoff interrupt, if an Xoff flow character detection caused the interrupt, the interrupt is cleared by an Xon flow character detection. If a special character detection caused the interrupt, the interrupt is cleared by a read of the ISR.
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