参数资料
型号: XR88C681J-F
厂商: Exar Corporation
文件页数: 28/101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
32
Rev. 2.11
X1
X2
TRAP
RST 7.5
RST 6.5
RST 5.5
INTR
-INTA
8085 CPU
-IO/M
-RD
-WR
-MEMR
ALE
C
AD0 - AD7
A8 - A15
Address
Decoder
A0 - A3
A4 - A7
A8 - A15
D0 - D7
A0 - A3
-CS
74LS373
1D - 8D
1Q - 8Q
-RD
-WR
XR88C681
-MEMW
-CS_DUART
-CS_OTHER_IC
Figure 9. Schematic of the XR88C681 Interface to the 8085 CPU Module (Memory Mapped).
The DUART’s -INTR pin was deliberately omitted from
Figure 9, because its use will be addressed in Figure 10
and
Figure 11.
8085 CPU Module Interrupt Structure
The 8085 CPU supports both Direct and “External”
Vectored Interrupt processing. The 8085 has 4 maskable
interrupt request inputs (RST 5.5, RST 6.5, RTS 7.5, and
INTR), and 1 non-maskable interrupt request input
(TRAP). When discussing interfacing for the interrupt
servicing of peripheral devices such as the DUART, we
are only concerned with the maskable interrupt request
inputs. Of the four maskable interrupt request inputs;
three of these inputs support “Direct Interrupt”
processing.
The remaining one interrupt request
supports “External Vectored Interrupt” processing.
Table 11 lists these Interrupt Request inputs and their
characteristics/features.
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