参数资料
| 型号： | XR21V1412IL32-F |
| 厂商： | Exar Corporation |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC UART FIFO USB DUAL 32QFN |
| 产品培训模块： | UART Product Overview XR21V141x Full-Speed USB UART Family |
| 特色产品： | XR21V141x Full-Speed USB UART |
| 标准包装： | 490 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 128 字节，384 字节 |
| 规程： | USB 2.0 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 带自动流量控制功能： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 托盘 |
| 配用： | 1016-1301-ND - EVAL BOARD FOR XR21V1412IL |
| 其它名称： | 1016-1302 |
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XR21V1412
18
2-CH FULL-SPEED USB UART
REV. 1.3.0
3.3
UART Register Descriptions
All register bits default to a value of ’0’ unless otherwise noted.
3.3.1
UART_ENABLE Register Description (Read/Write)
This register enables the UART TX and RX. For proper functionality, the UART TX and RX must be enabled in
the following order:
FIFO_ENABLE_CHx = 0x1
// Enable TX FIFO
UART_ENABLE = 0x3
// Enable TX and RX of that channel
FIFO_ENABLE_CHx = 0x3
// Enable RX FIFO
UART_ENABLE[0]: Enable UART TX
Logic 0 = UART TX disabled.
Logic 1 = UART TX enabled.
UART_ENABLE[1]: Enable UART RX
Logic 0 = UART RX disabled.
Logic 1 = UART RX enabled.
UART_ENABLE[7:2]: Reserved
These bits are reserved and should remain ’0’.
3.3.2
CLOCK_DIVISOR0, CLOCK_DIVISOR1, CLOCK_DIVISOR2 Register Description (Read/Write)
These registers are used for programming the baud rate. The V1412 uses a 19-bit divisor and 16-bit mask
register. Using the internal 48MHz oscillator, the 19-bit divisor is calculated as follows:
CLOCK_DIVISOR = Trunc ( 48000000 / Baud Rate )
For example, if the the baud rate is 115200bps, then
CLOCK_DIVISOR = Trunc ( 48000000 / 115200 ) = Trunc (416.66667) = 416
CLOCK_DIVISOR0[7:0]: Baud rate clock divisor bits [7:0]
CLOCK_DIVISOR1[7:0]: Baud rate clock divisor bits [15:8]
CLOCK_DIVISOR2[2:0]: Baud rate clock divisor bits [18:16]
CLOCK_DIVISOR2[7:3]: Reserved
These bits are reserved and should remain ’0’.
3.3.3
TX_CLOCK_MASK0, TX_CLOCK_MASK1 Register Description (Read/Write)
A look-up table is used for the value of the 16-bit TX Clock mask registers. The index of the look-up table is
calculated as follows:
index = Trunc ( ( ( 48000000 / Baud Rate ) - CLOCK_DIVISOR ) * 32)
For example, if the baud rate is 115200bps, then the index will be:
index = Trunc ( ( ( 48000000 / 115200 ) - 416 ) * 32) = Trunc (21.3333) = 21
The values for some baud rates to program the TX_CLOCK_MASK registers are listed in Table 8. For baud
rates that are not listed, use the index to select TX_CLOCK_MASK register values from Table 9.
3.3.4
RX_CLOCK_MASK0, RX_CLOCK_MASK1 Register Description (Read/Write)
The values for some baud rates to program the RX_CLOCK_MASK registers are listed in Table 8. For baud
rates that are not listed, use the same index calculated for the TX_CLOCK_MASK register to select
RX_CLOCK_MASK register values from Table 9.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR21V1412IL32TR-F | 功能描述:USB 接口集成电路 2 Chan FS USB UART w/ 256 Byte FIFO RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| XR21V1414 | 制造商:EXAR 制造商全称:EXAR 功能描述:4-CH FULL-SPEED USB UART |
| XR21V1414_10 | 制造商:EXAR 制造商全称:EXAR 功能描述:4-CH FULL-SPEED USB UART |
| XR21V1414IM-0A-EB | 功能描述:界面开发工具 Eval Board for XR21V1414IM48-F RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| XR21V1414IM-0B-EB | 功能描述:界面开发工具 For XR21V1414 TQFP48 USB, RS232;No Cables RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
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