Datasheet

DS26504 T1/E1/J1/64KCC BITS Element
39 of 129
7.7 Interrupt Information Registers
The Interrupt Information Registers (IIRs) provide an indication of which Status Registers (SR1 to SR4)
are generating an interrupt. When an interrupt occurs, the host can read IIR to quickly identify which of
the four status registers are causing the interrupt.
Register Name:
IIR
Register Description:
Interrupt Information Register
Register Address:
13h
Bit # 7 6 5 4 3 2 1 0
Name — — — SR5 SR4 SR3 SR2 SR1
Default 0 0 0 0 0 0 0 0
HW
Mode
X X X X X X X X
Bit 0: Status Register 1 (SR1)
0 = Status Register 1 interrupt not active.
1 = Status Register 1 interrupt active.
Bit 1: Status Register 2 (SR2)
0 = Status Register 2 interrupt not active.
1 = Status Register 2 interrupt active.
Bit 2: Status Register 3 (SR3)
0 = Status Register 3 interrupt not active.
1 = Status Register 3 interrupt active.
Bit 3: Status Register 4 (SR4)
0 = Status Register 4 interrupt not active.
1 = Status Register 4 interrupt active.
Bit 4: Status Register 5 (SR5)
0 = Status Register 5 interrupt not active.
1 = Status Register 5 interrupt active.
Bits 5 to 7: Unused