参数资料
型号: XR88C681J-F
厂商: Exar Corporation
文件页数: 42/101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:
带CMOS:
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
XR88C681
45
Rev. 2.11
-
INTR output. This action will, in turn, cause the -INT input
of the CPU to be asserted. Once the CPU has completed
its current instruction, the CPU Module will assert the
-
INTA signal. This will in turn assert the -IACK (Interrupt
Acknowledge) input to the DUART. The purpose of the
asserted -IACK signal is to inform the DUART that the
very next cycle will be an “IACK” or “Interrupt
Acknowledge” cycle. DUART, in response to the -IACK
signal, will place the contents of the Interrupt Vector
Register (IVR) on the Data Bus. This data will be read by
the CPU, and program control will be branched to the
appropriate interrupt service routine. In the case of the
Z-80 CPU, this location is a 16 bit address which is
determined from
Table 13.
Most Significant Byte
Least Significant Byte
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Contents of the I Register (within the CPU)
The 7 Most Significant Bits within the Interrupt Vector
Register of the DUART
0
Note:
The LSB of the IVR is always set to “0” once read by the CPU. Interrupt Service Routines must begin at even ddresses.
Table 13. The Relationship between the Contents of the Interrupt Vector Register (of the DUART)
and the location of the Interrupt Service Routine (Z-80 CPU)
Additionally, the user must be aware of the contents that he/she loads into the I Register of the CPU, during run time.
-INTA
to lower priority
peripheral
Address
Decoder
Circuitry
A0 - A15
A0 - A3
D0 - D7
-CS
CS_DUART
-INTR
-INT
-WR
-RD
-MREQ
-IORQ
M1
-WR
-RD
-MEMW
-IACK
Z80 CPU
XR88C681
-MEMR
IEI
IEO
from Vcc or higher
priority peripheral
Figure 19. Schematic of an Approach to Interface the DUART to the Z-80
CPU (for Z-Mode Operation)
相关PDF资料
PDF描述
ST16C552AIJ68-F IC UART FIFO 16B DUAL 68PLCC
MS27474T10A98P CONN RCPT 6POS JAM NUT W/PINS
XR88C192IV-F IC UART FIFO DUAL 44LQFP
MS27484T8F35PA CONN PLUG 6POS STRAIGHT W/PINS
ST16C2550IJ44-F IC UART FIFO 16B DUAL 44PLCC
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