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参数资料
| 型号： | ST16C2550IQ48 |
| 厂商： | EXAR CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | DUAL UART WITH 16-BYTE TRANSMIT AND RECEIVE FIFO’S |
| 中文描述： | 2 CHANNEL(S), 4M bps, SERIAL COMM CONTROLLER, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件页数： | 12/34页 |
| 文件大小： | 443K |
| 代理商： | ST16C2550IQ48 |
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ST16C2550
12
Rev. 3.20
DMA Operation
The 2550 FIFO trigger level provides additional flex-
ibility 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 FIFOs in the DMA
mode (FCR bit-3). When the transmit and receive
FIFOs 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 trans-
mit FIFO. In this mode, the 2550 sets the interrupt
output pin when characters in the transmit FIFO is
below 16, or the characters in the receive FIFOs 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. MCR register bits 0-3 are used
for controlling loop-back diagnostic testing. In the
loop-back mode INT enable and MCR bit-2 in the MCR
register (bits 3/2) control the modem -RI and -CD
inputs respectively. MCR signals -DTR and -RTS (bits
0-1) are used to control the modem -CTS and -DSR
inputs respectively. The transmitter output (TX) and
the receiver input (RX) are disconnected from their
associated interface pins, and instead are connected
together internally (See Figure 4). The -CTS, -DSR, -
CD, and -RI are disconnected from their normal
modem control inputs pins, and instead are connected
internally to -DTR, -RTS, INT enable and MCR bit-2.
Loop-back test data is entered into the transmit hold-
ing 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 compares 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. However, the interrupts can only
be read using lower four bits of the Modem Control
Register (MCR bits 0-3) instead of the four Modem
Status Register bits 4-7. The interrupts are still con-
trolled by the IER.
相关PDF资料 |
PDF描述 |
|---|---|
| ST16C2550 | 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）) |
| 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) |
| ST16C450CP40 | UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST16C2550IQ48-F | 功能描述:UART 接口集成电路 2.97V-5.5V 16B FIFO temp -45 to 85C;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 |
| ST16C2550IQ48TR-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 |
| ST16C2552 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO |
| ST16C2552_06 | 制造商:EXAR 制造商全称:EXAR 功能描述:2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO |
| ST16C2552CJ | 制造商:EXAR 功能描述:IC , Dual UART 4MBPS 5.5 44 PLCC 制造商:Exar Corporation 功能描述: 制造商:XIC 功能描述: 制造商:Exar Corporation 功能描述:UART, 44 Pin, Plastic, PLCC |
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