PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 162

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

3.2
Since the ISAC-S provides only one interrupt request output (INT), the cause of an interrupt is
determined by the microprocessor by reading the Interrupt Status Register ISTA. In this
register, seven interrupt sources can be directly read. The LSB of ISTA points to eight non-
critical interrupt sources which are indicated in the Extended Interrupt Register EXIR
(figure 68).
Figure 68
ISAC
Semiconductor Group
®
-S Interrupt Structure
Interrupt Structure and Logic
MASK
CISQ
RME
RPF
RSC
XPR
SIN
EXI
TIN
INT
CISQ
ISTA
RME
RSC
RPF
XPR
TIN
SIN
EXI
MOS
SAW
WOV
EXIR
XMR
PCE
RFO
SOV
XDU
MOCR
MRE0
MRE1
MXE0
MXE1
162
MOSR
MDR0
MER0
MDA0
MAB0
MDR1
MER1
MDA1
MAB1
SQXR
SQIE
CI1E
Operational Description
IOM -2
R
only
CIC0
CIR0
SQC
CIC1
BAS
C
O
D
R
0
SQRR
ITD02578
CIR1