pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 149

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

PEF 81902
Register Description
â
After the T-SMINT
IX has requested an interrupt by setting its INT pin to low, the host
â
must read first the T-SMINT
IX interrupt status register (ISTA) in the associated interrupt
â
service routine. The INT pin of the T-SMINT
IX remains active until all interrupt sources
are cleared. Therefore, it is possible that the INT pin is still active when the interrupt
service routine is finished.
Each interrupt indication of the interrupt status registers can selectively be masked by
setting the respective bit in the MASK register.
For some interrupt controllers or hosts it might be necessary to generate a new edge on
the interrupt line to recognize pending interrupts. This can be done by masking all
interrupts at the end of the interrupt service routine (writing FF
into the MASK register)
H
and writing back the old mask to the MASK register.
Data Sheet
135
2001-11-12