xr82c684 Exar Corporation, xr82c684 Datasheet - Page 21

• Manufacturer Part Number: xr82c684
• Description: Cmos Quad Channel Uart Quart
• Manufacturer: Exar Corporation

C.1 Interrupt Status Registers (ISR1 and ISR2)
ISR1 Register Bit Format
ISR2 Register Bit Format
C.1.1 ISR1 Register - Channels A and B
ISR1[7]: Input Port Change of State:


Section E
Please note that in order to enable this Interrupt
Condition, the user must do two things:
1. Write the appropriate data to the lower nibble of the
2. Write a logic “1” to IMR1[7].
Input Port
Input Port
Auxiliary Control Register, ACR1[3:0]. In this step, the
user is specifying which of the four Input Pins, IP0 - IP3,
should trigger an “Input Port Change” Interrupt request.
Change
Change
Bit 7
Bit 7
Delta Break
Delta Break
Bit 6
Bit 6
B
D
FFULL D
FFULLB
RXRDY/
RXRDY/
Bit 5
Bit 5
TXRDY D
TXRDYB
Bit 4
Bit 4
Counter #1
Counter #2
ISR1[6] Delta Break Indicator - Channel B:
ISR1[5] RXRDY/FFULL B - Channel B Receiver
Ready or FIFO Full
Ready
Ready
Bit 3
Bit 3
Delta Break
Delta Break
Bit 2
Bit 2
A
C
Section G.2
XR82C684
FFULL C
FFULLA
RXRDY/
RXRDY/
Bit 1
Bit 1
Table 2
TXRDY C
TXRDYA
Bit 0
Bit 0