XR88C681CN/40 EXAR [Exar Corporation], XR88C681CN/40 Datasheet - Page 63

• Manufacturer Part Number: XR88C681CN/40
• Description: CMOS DUAL CHANNEL UART (DUART)
• Manufacturer: EXAR [Exar Corporation]



Note: This “two-tiered” interrupt enabling/disabling approach, for the “Input Change of State” interrupt allows tremendous flexibility


E.3 28 Pin Packaged DUARTs
F. OUTPUT PORT
BRG Set
note that the applicable bits, within the ACR register, are shaded.
Select
Bit 7
for the 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.
Bit 6
Counter/Timer Mode and Source
Bit 5
Table 7
Table 23. ACR- Auxiliary Control Register
Bit 4
invoking the “SET OUTPUT PORT BITS” command, the
user is setting the bits (to logic “1”) in the OPR
Delta IP3
Interrupt
Bit 3
Delta IP2
Interrupt
Bit 2
Table 1
It is important to note that when
XR88C681
Delta IP1
Interrupt
Bit 1
Table 23 Please
Delta IP0
Interrupt
Bit 0