XR88C681CP/28 EXAR [Exar Corporation], XR88C681CP/28 Datasheet - Page 48

• Manufacturer Part Number: XR88C681CP/28
• Description: CMOS Dual Channel UART (DUART)
• Manufacturer: EXAR [Exar Corporation]

Figure 21 and Figure 22 present the 8086 CPU Mode, when operating in the “min” and “max” modes, respectively.
Rev. 2.11
Vcc
INTR
-INTA
HOLD
-DEN
DT/-R
MN/-MX
8086 CPU
Figure 21. Schematic of the 8086 CPU Mode (Min Mode)
AD8 - AD15
AD0 - AD7
M/-IO
ALE
-RD
-WR
48
D
C
D
C
74LS373
74LS373
Q
Q
D0 - D7
A0 - A7
D8 - D15
A8 - A15
-IOR
-MEMR
-IOW
-MEMW