xr88c681 Exar Corporation, xr88c681 Datasheet - Page 90

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

Input Port
Input Port
BRG Set
Delta IP3
0 = Set1
1 = Set2
Change
Change
1 = Yes
1 = Yes
1 = On
C/T(15)
Select
0 = No
0 = No
0 = Off
C/T(7)
IVR(7)
Rev. 2.11
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
Delta Break
Delta Break
Delta IP2
1 = On
C/T(14)
1 = Yes
1 = Yes
0 = No
0 = No
0 = Off
C/T(6)
IVR(6)
Counter/Timer #1 Mode and Source
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
Bit 6
B
B
Table 39. Counter/Timer Upper Byte Register, CTUR
Table 40. Counter/Timer Lower Byte Register, CTLR
See Table 7
Table 36. Input Port Configuration Register , IPCR
Delta IP1
FFULLB
FFULLB
RXRDY/
RXRDY/
C/T(13)
1 = Yes
1 = Yes
1 = On
0 = Off
0 = No
0 = No
IVR(5)
C/T(5)
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Bit 5
Table 35. Auxiliary Control Register: ACR
Table 41. Interrupt Vector Register: IVR
Table 37. Interrupt Status Register, ISR
Table 38. Interrupt Mask Register, IMR
Delta IP0
TXRDYB
TXRDYB
1 = Yes
1 = Yes
1 = On
C/T(12)
0 = Off
0 = No
0 = No
IVR(4)
C/T(4)
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
Bit 4
90
Counter #1
Counter #1
Delta IP3
Interrupt
1 = High
0 = OFF
0 = Low
1 = Yes
1 = On
C/T(11)
1 = ON
Ready
0 = No
Ready
0 = Off
C/T(3)
IVR(3)
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
Bit 3
IP3
Delta Break
Delta Break
Delta IP2
Interrupt
1 = High
0 = OFF
0 = Low
1 = On
C/T(10)
1 = Yes
1 = ON
0 = No
0 = Off
IVR(2)
C/T(2)
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
Bit 2
IP2
A
A
Delta IP1
Interrupt
RXRDY/
FFULLA
RXRDY/
FFULLA
0 = OFF
1 = High
0 = Low
1 = Yes
1 = On
1 = ON
0 = Off
0 = No
IVR(1)
C/T(9)
C/T(1)
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
Bit 1
IP1
Delta IP0
Interrupt
TXRDYA
TXRDYA
0 = OFF
1 = High
0 = Low
1 = Yes
1 = On
1 = ON
0 = No
0 = Off
C/T(8)
C/T(0)
IVR(0)
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
Bit 0
IP0