xr68c681 Exar Corporation, xr68c681 Datasheet - Page 38

• Manufacturer Part Number: xr68c681
• Description: Cmos Dual Channel Uart Duart
• Manufacturer: Exar Corporation

Bits 7 - 4: “Change in Logic State” Identification Bits
Bits 3 - 0: “The Current State of Input Pins IP0 - IP3”


Note:
user. Setting or clearing the bits in ACR[3:0] allows the user to specify exactly which Input Port pins to be enabled (or disabled) for
generating the “Input Port Change of State” interrupt. Setting or clearing IMR[7] allows the user to “globally” enable or disable this
interrupt.
XR68C681
This “two-tiered” interrupt enabling/disabling approach, for the “Input Change of State” interrupt allows tremendous flexibility for the
BRG Set
Select
Bit 7



Bit 6
Counter/Timer Mode and Source
Bit 5
Table 7
Table 14. ACR- Auxiliary Control Register
Bit 4
Delta IP3
Interrupt
Bit3
Delta IP2
Interrupt
Bit 2
Delta IP1
Interrupt
Bit 1
Delta IP0
Interrupt
Bit 0