The Philips
Semiconductors SCN68681 Dual Universal Asynchronous Receiver/Transmitter (DUART)
is a single-chip MOS-LSI communications device that provides two independent
full-duplex asynchronous receiver/transmitter channels in a single
package.飞利浦半导体SCN68681双通用异步接收器/发送器（DUART）是一种单芯片的MOS-LSI通信设备，可提供两个独立的全双工异步接收器/发射器，在单一封装渠道。
It is compatible
with other S68000 family devices, and can also interface easily with other
microprocessors.这是与其他S68000系列器件兼容，也可以方便地与其他微处理器接口。The DUART can be
used in polled or interrupt driven systems.DUART可用于轮询或中断驱动系统。
The operating
mode and data format of each channel can be programmed
independently.每个通道的工作模式和数据格式，可以独立编程。Additionally,
each receiver and transmitter can select its operating speed as one of eighteen
fixed baud rates, a 16X clock derived from a programmable counter/timer, or an
external or 16X
clock.此外，每个接收器和发射器，可以选择作为一个十八固定波特率，16X时钟来自一个可编程计数器/定时器，或外部或16X时钟的运??行速度。
The baud rate
generator and counter/timer can operate directly from a crystal or from external
clock inputs.波特率发生器和计数器/定时器，可以直接从晶体或外部时钟输入。The ability to
independently program the operating speed of the receiver and transmitter make
the DUART particularly attractive for dual-speed channel applications such as
clustered terminal
systems.接收机和发射机的运行速度，能够独立编程，使DUART如集群终端系统双速通道应用，特别是有吸引力的。Each receiver is
quadruply buffered to minimize the potential of receiver overrun or to reduce
interrupt overhead in interrupt driven
systems.每个接收的异体四缓冲，以减少潜在的接收器溢出或中断驱动系统，以减少中断开销。In addition, a
flow control capability is provided to disable a remote DUART transmitter when
the buffer of the receiving device is
full.此外，流量控制能力提供禁用远程的DUART发射接收设备的缓冲区已满时。Also provided on
the SCN68681 are a multipurpose 6-bit input port and a multipurpose 8-bit output
port.还提供了关于SCN68681是一种多用途的6位输入端口和一个多功能的8位输出端口。These can be used
as general purpose I/O ports or can be assigned specific functions (such as
clock inputs or status/interrupt outputs) under program control.这些可以作为通用I
/ O端口，或可分配程序的控制下的特定功能（如时钟输入或输出状态/中断）。

· 16-bit
programmable Counter/Timer· Parity, framing, and overrun error detection· False
start bit detection· Line break detection and generation· Programmable channel
mode·16位可编程计数器/定时器·奇偶，帧和超限错误检测·虚假启动位检测·线断线检测和代·可编程通道模式

Can serve as
clock or control inputs Change-of-state detection on four inputs 100k typical
pull-up resistors可以作为时钟或控制输入状态变化的检测四个输入100K典型的上拉电阻

Single interrupt
output with eight maskable interrupting conditions Interrupt vector output on
interrupt acknowledge Output port can be configured to provide a total up to six
separate wire-ORable interrupt
outputs单中断输出与八个屏蔽的中断条件在中断的中断向量输出应答输出端口可以配置提供一个总的六个单独ORable线的中断输出

· S68000 bus
compatible· Dual full-duplex asynchronous receiver/transmitter· Quadruple
buffered receiver data registers· Programmable data format
·S68000总线兼容·双全双工异步接收器/发射器·四路缓冲接收数据寄存器·可编程的数据格式

to 8 data bits
plus parity Odd, even, no parity or force parity or 2 stop bits programmable in
1/16-bit increments8位数据加上奇偶奇，偶，无校验或武力平价或2个停止位可编程1/16-bit增量

selectable from:
22 fixed rates: to 115.2k baud Non-standard rates 115.2kb Non-standard
user-defined rate derived from programmable counter/timer External or 16X
clock选择：22个固定利率：115.2K波特率非标准速率115.2kb非标准用户定义的速率从可编程计数器/定时器的外部或16X时钟派生

· Automatic
wake-up mode for multidrop applications· Start-end break interrupt/status·
Detects break which originates in the middle of a character· On-chip crystal
oscillator· Single +5V power supply· Commercial and industrial temperature
ranges available· DIP and PLCC packages
·启动年底突破中断/状态多点应用·自动唤醒模式·检测字符中间的休息·片内晶体振荡器·单+5
V的电源供应器·商用和工业温度范围可·DIP和PLCC封装

COMMERCIAL
DESCRIPTION 40-Pin Ceramic Dual In-Line Package (cerdip) 40-Pin Plastic Dual
In-Line Package (DIP) 44-Pin Plastic Leaded Chip Carrier (PLCC) VCC to +70°C Not
available SCN68681C1N40 SCN68681C1A44 INDUSTRIAL VCC SCN68681E1N40 SCN68681E1A44
DWG SOT129-1
SOT187-2商业描述40引脚陶瓷双列直插式封装（CERDIP）40引脚塑料双列直插式封装（DIP），44引脚塑料引线芯片载体（PLCC）VCC至+70°C不提供SCN68681C1N40
SCN68681C1A44工业VCC SCN68681E1N40 SCN68681E1A44的DWG SOT129-1 SOT187-2

SYMBOL TA TSTG
PARAMETER Operating ambient temperature range2 Storage temperature range All
voltages with respect to ground3 RATING See Note to +6.0 UNIT
°CV符号局长TSTG参数工作环境温度范围2存储温度范围内的所有方面的电压ground3打分至+6.0单位°CV见注

NOTES:
1.注：1。Stresses above
those listed under Absolute Maximum Ratings may cause permanent damage to the
device.以上绝对最大额定值下所列的那些应力可能会造成永久性损坏设备。This is a stress
rating only and functional operation of the device at these or any other
condition above those indicated in the operation section of this specification
is not implied.这是应力等级只和功能设备的操作，在这些或以上在本规范的操作部分所标明的任何其他条件不暗示。2.
2。For operating at
elevated temperatures, the device must be derated based on +150oC maximum
junction temperature.在高温下操作，设备必须降低的基础上+150 OC最大结温。3.
3。This product
includes circuitry specifically designed for the protection of its internal
devices from damaging effects of excessive static
charge.此产品包括电路专门用于设计其内部设备的保护过度静电的破坏性影响。Nonetheless, it is suggested that conventional precautions
be taken to avoid applying any voltages larger than the rated
maxima.尽管如此，它建议采取常规的预防措施，以避免施加任何电压大于额定最大值。4.
4。Parameters are
valid over specified temperature range.参数是在特定的温度范围内有效。See Ordering
information table for applicable operating temperature range and VCC supply
range.适用的工作温度范围和VCC电源电压范围参见订货信息表。                                                                                                                                                感谢您来到【深圳市博大电子】，愿我真心的服务，换来你愉快的购物之旅！

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