XR88C681_06 Datasheet, PDF (35/101 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

XR88C681
U1
INTR
-INTA
8085 CPU
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
ALE
Vcc
U5
U6
Vcc
U3
-OE1 -OE2
D0
D1
D2
DO0
DO1
DO2
D3 _DO3
D4
D5
D6
D7
DO4
DO5
DO6
DO7
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
1D
1Q
2D
2Q
3D
3Q
4D
4Q
5D
5Q
6D
6Q
7D
7Q
8D
8Q
C
74LS373
SN74LS244
A0
A1
A2
A3
A4
A5
A6
A7
U4
-INTR
XR88C681
Figure 11. The XR88C681/8085 CPU Interface for Vectored Interrupt Processing (In-
terrupt Service Routine is located at 0020₁₆ in system memory)
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
35