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参数资料
| 型号： | ST16C2550 |
| 厂商： | Exar Corporation |
| 英文描述： | Dual UART with 16-Byte of Transmit and Receive FIFO(双通用异步接收器/发送器（带16字节接收和发送先进先出）) |
| 中文描述： | 双UART具有16的发送和接收FIFO（双通用异步接收器/发送器（带16字节接收和发送先进先出字节）） |
| 文件页数： | 12/34页 |
| 文件大小： | 314K |
| 代理商： | ST16C2550 |
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ST16C2550
12
Rev. 3.40
DMA Operation
The 2550 FIFO trigger level provides additional flexibility
to the user for block mode operation. LSR bits 5-6
provide an indication when the transmitter is empty or
has an empty location(s). The user can optionally
operate the transmit and receive FIFO’s in the DMA
mode (FCR bit-3). When the transmit and receive
FIFO’s are enabled and the DMA mode is deactivated
(DMA Mode “0”), the 2550 activates the interrupt output
pin for each data transmit or receive operation. When
DMA mode is activated (DMA Mode “1”), the user takes
the advantage of block mode operation by loading or
unloading the FIFO in a block sequence determined by
the receive trigger level and the transmit FIFO. In this
mode, the 2550 sets the TXRDY( or RXRDY) output pin
when characters in the transmit FIFO is below 16, or the
characters in the receive FIFO’s are above the receive
trigger level.
Loop-back Mode
The internal loop-back capability allows onboard diag-
nostics. In the loop-back mode the normal modem
interface pins are disconnected and reconfigured for
loop-back internally (See Figure 4). MCR register bits 0-
3 are used for controlling loop-back diagnostic testing.
In the loop-back mode, the transmitter output (TX) and
the receiver input (RX) are disconnected from their
associated interface pins, and instead are connected
together internally . The -CTS, -DSR, -CD, and -RI are
disconnected from their normal modem control inputs
pins, and instead are connected internally to -RTS, -
DTR, MCR bit-3 (-OP2) and MCR bit-2 (-OP1). Loop-
back test data is entered into the transmit holding
register via the user data bus interface, D0-D7. The
transmit UART serializes the data and passes the serial
data to the receive UART via the internal loop-back
connection. The receive UART converts the serial data
back into parallel data that is then made available at the
user data interface, D0-D7. The user optionally com-
pares the received data to the initial transmitted data for
verifying error free operation of the UART TX/RX circuits.
In this mode, the receiver and transmitter interrupts are
fully operational. The Modem Control Interrupts are also
operational.
相关PDF资料 |
PDF描述 |
|---|---|
| ST16C2552 | Dual UART with 16-Byte Transmit and Receive FIFO(双通用异步接收器/发送器（带16字节接收和发送先进先出）) |
| ST16C450 | UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART) |
| ST16C450CJ44 | UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART) |
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| ST16C450CQ48 | UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST16C2550_04 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.97V TO 5.5V DUART WITH 16-BYTE FIFO |
| ST16C2550CJ-0A-EB | 功能描述:界面开发工具 Supports C2550 44 ld PLCC, ISA Interface 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 |
| ST16C2550CJ44 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.97V TO 5.5V DUART WITH 16-BYTE FIFO |
| ST16C2550CJ44-F | 功能描述:UART 接口集成电路 2.97V-5.5V 16B FIFO temp 0C to 70C; UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| ST16C2550CJ44TR-F | 功能描述:UART 接口集成电路 DUAL UART W/16BYTE FIFO RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
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