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| 型号： | XR88C681J-F |
| 厂商： | Exar Corporation |
| 文件页数： | 7/101页 |
| 文件大小： | 0K |
| 描述： | IC UART CMOS DUAL 44PLCC |
| 标准包装： | 27 |
| 特点： | * |
| 通道数： | 2，DUART |
| FIFO's： | 1 字节，3 字节 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 带并行端口： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-LCC（J 形引线） |
| 供应商设备封装： | 44-PLCC（16.59x16.59） |
| 包装： | 管件 |
| 其它名称： | 1016-1329 |
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XR88C681
13
Rev. 2.11
SYSTEM DESCRIPTION
The XR88C681 consists of two independent, full-duplex
communication channels; each consisting of their own
Transmitter and Receiver. Each channel of the DUART
may be independently programmed for operating mode
and data format. The DUART can interface to a wide
range of processors with a minimal amount of
components. The operating speed of each receiver and
transmitter may be selected from one of 23 internally
generated fixed bit rates, from a clock derived from an
internal counter/timer, or from an externally supplied 1x or
16x clock. The bit rate generator (the source of the 23
different fixed bit rates) can operate directly from a crystal
connected across two pins or from an external clock. The
ability to independently program the operating speed of
the receiver and transmitter of each channel makes the
DUART attractive for split speed channel applications
such as clustered terminal systems.
Receiver data is quadrupled buffered and the transmitter
data is dual-buffered via on-chip FIFOs in order to
minimize the risk of receiver overrun and to reduce
overhead in interrupt driven applications. The DUART
also provides a flow control capability to inhibit
transmission from a remote device when the buffer of the
receiving DUART is full, thus preventing loss of data.
The DUART also provides a general purpose 16 bit
counter/timer (which may also be used as programmable
bit rate generators), a 7 bit multi-purpose input port and an
8 bit multi-purpose output port (for the 40 pin DIP and 44
pin PLCC packages only).
PRINCIPLES OF OPERATION
Figure 1 presents an overall block diagram of the DUART.
As illustrated in the block diagram, the DUART consists of
the following major functional blocks:
D
Data Bus Buffer
D
Interrupt Control
D
Input Port
D
Serial Communication Channels A and B
D
Operation Control
D
Timing Control
D
Output Port
A. DATA BUS BUFFER
The data bus buffer provides the interface between the
internal (within the chip) and external data buses. It is
controlled by the operation control block to allow data
transfers to take place between the host CPU and the
DUART.
B. OPERATION CONTROL BLOCK
The control logic of the Operation Control block receives
operating commands from the CPU and generates proper
signals to the various sections of the DUART. The
Operation Control Block functions as the user interface to
the rest of the device. Specifically, it is responsible for
DUART Register Address Decoding, and Command
Decoding. Therefore all commands to set baud rates,
parity, other communication protocol parameters, start or
stop the Counter/Timer or reading a “status register” to
monitor data communication performance must go
through the Operation Control Block.
The Operation Control Block will control DUART
performance based upon the following input signals.
Address Inputs, A0 - A3
-RD
-WR
-CS
RESET
When using the 6800 family processor, the DUART will
require some glue logic. Interfacing a 6800 Family
Processor to the DUART can be easily achieved by
including a small amount of external logic devices, as
depicted in
Figure 2.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XR88C681JTR-F | 功能描述:UART 接口集成电路 Dual Channel 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 |
| XR88C681MN-S0968 | 制造商:Exar Corporation 功能描述: |
| XR88C681N/40 | 制造商:EXAR 制造商全称:EXAR 功能描述:CMOS DUAL CHANNEL UART (DUART) |
| XR88C681P/28 | 制造商:Exar Corporation 功能描述: |
| XR88C681P/28-F | 功能描述:UART 接口集成电路 Dual Channel 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 |
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