xr88c681 Exar Corporation, xr88c681 Datasheet - Page 35

• Manufacturer Part Number: xr88c681
• Description: Cmos Dual Channel Uart Duart
• Manufacturer: Exar Corporation

C.6.1.4 68HC11 Microcontroller
Motorola manufactures a family of microcontrollers, referred to as the MC68HC11 microcontrollers. This family of
microcontrollers offers some of the following amenities:
D 5 Multi-Function Parallel Ports
D ROM or EPROM
D RAM
D A/D Converter
Rev. 2.11
8085 CPU
U1
Figure 11. The XR88C681/8085 CPU Interface for Vectored Interrupt Processing (In-
-INTA
INTR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
terrupt Service Routine is located at 0020
1D
2D
3D
4D
5D
6D
7D
8D
C
74LS373
U5
35
1Q
3Q
6Q
7Q
2Q
4Q
5Q
8Q
D0
D1
D2
D3
D4
D5
D6
D7
A1
A0
A2
A3
A6
A7
A4
A5
U3
SN74LS244
DO0
DO1
DO2
DO3
DO4
DO5
DO6
DO7
-OE1 -OE2
U6
Vcc
16
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
in system memory)
Vcc
XR88C681
-INTR
XR88C681
U4