参数资料
| 型号： | XR88C681CP/40-F |
| 厂商： | Exar Corporation |
| 文件页数： | 37/101页 |
| 文件大小： | 0K |
| 描述： | IC UART CMOS DUAL 40PDIP |
| 标准包装： | 9 |
| 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： | 通孔 |
| 封装/外壳： | 40-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 40-PDIP |
| 包装： | 管件 |
| 其它名称： | 1016-1328-5 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页当前第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页
XR88C681
40
Rev. 2.11
CPU
-INT
-IACK
-INTR
IEI
IEO
-IACK
-INTR
IEI
IEO
-IACK
-INTR
IEI
IEO
-IACK
-INTR
IEI
IEO
-IACK
VCC
HIGHEST
LOWEST
PRIORITY
Figure 15. A Diagram of Numerous DUARTs Configured in an Interrupt
Daisy Chain (for Z-Mode Operation)
VCC
In addition to the -INTR and -IACK pins, the Z-Mode
DUART also uses the IEI and IEO pins; which are defined
as follows:
IEI - Interrupt Enable Input
This active-high input is only available if the DUART is
configured to operate in the Z-Mode. If this input is at a
logic “high” then all unmasked interrupt requests, from
this DUART, are enabled.
Note:
Those interrupts which have been masked out by the IMR are
still disabled. However, if this input is at a logic “low”, then all
interrupts (whether masked or unmasked) are disabled.
Hence, IEI can act to globally disable all DUART interrupt
requests.
IEO - Interrupt Enable Output
This active-high output is only available if the DUART is
configured to operate in the Z-Mode. This output is often
times connected to the IEI input of another (lower priority)
device. This output is “high” if all of the following
conditions are true.
D
The device’s IEI input is at a logic “high”
D
The device is not requesting an interrupt from the
CPU
D
An interrupt, requested by the device, has just been
serviced
If any of these conditions are false, then the IEO pin will be
at a logic “low”.
Note
:
Once the IEO pin has toggled “low”, and the CPU has ac-
knowledged the interrupt request and has completed the inter-
rupt service routine, the IEO pin will remain “low” until the user
invokes the “RESET IUS” command (see Table 3). Therefore,
if the DUART is going to operate in the Z-Mode, the user must
include the “RESET IUS” Command at the very end of the
DUART interrupt service routine.
System Level Application of the IEI and IEO pins
Figure 15 depicts a series of DUARTs connected in a
daisy-chain fashion. In this figure, the left-most DUART
has the highest interrupt priority. This is because this
DUART’s IEI input is hardwired to Vcc. Therefore, the
unmasked interrupt requests, from this DUART are
always enabled. The DUART device, located just to the
right of the “highest interrupt priority” device is of a lower
interrupt priority. This is because the IEI input of this lower
priority device is connected to the IEO output of the
highest priority DUART. Whenever the “highest priority”
device requests an interrupt, its IEO output will toggle
“low”. This will in turn, disable the “lower priority” device
相关PDF资料 |
PDF描述 |
|---|---|
| AT89C51RB2-RLRIM | IC MCU FLASH 8051 16K 5V 44-VQFP |
| XR16V2550IM-F | IC UART FIFO 16B 48TQFP |
| MAX7311AWG+T | IC I/O EXPANDER I2C 16B 24SOIC |
| XR16L2750CM-F | IC UART FIFO 64B DUAL 48TQFP |
| XR20M1172IL32-F | IC UART FIFO I2C/SPI 64B 32QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XR88C681J | 制造商:Exar Corporation 功能描述: |
| XR88C681J-F | 功能描述:UART 接口集成电路 0.5V-2V UART temp -45 to 85C 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 |
| 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) |
发布紧急采购，3分钟左右您将得到回复。