Intel PXA255 - Manual (Page 129)

Intel® PXA255 Processor Developer’s Manual 4-25
System Integration Unit
4.2.2.5 Interrupt Controller Pending Register (ICPR)
The ICPR, shown in Table 4-35 , is a 32-bit read-only register that shows all active interrupts in the
system. These bits are not affected by the state of the mask register (ICMR). Clearing the interrupt
status bit at the source, automatically clears the corresponding ICPR flag, provided there are no
other interrupt status bits set within the source unit.
Table 4-36 shows the pending interrupt source assigned to each bit position in the ICPR. Also
included in the table are the source units for the interrupts and the number of second-level
interrupts associated with each. For more information on the second-level interrupts, see the
section that corresponds to its name in the Source Unit column.
Table 4-35. ICPR Bit Definitions (Sheet 1 of 3)
Physical Address
0x40D0_0010
ICPR System Integration Unit
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IS31 IS30 IS29 IS28 IS27 IS26 IS25 IS24 IS23 IS22 IS21 IS20 IS19 IS18 IS17
reser
ved
IS14 IS13 IS12 IS1
1
IS10
IS9 IS8
reser
ved
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bits Name Description
<31> IS31
RTC Alarm Match Register Interrupt Pending
0 – Interrupt NOT pending due to RTC Alarm Match Register.
1 – Interrupt pending due to RTC Alarm Match Register.
<30> IS30
RTC HZ Clock Tick Interrupt Pending
0 – Interrupt NOT pending due to RTC HZ Clock Tick.
1 – Interrupt pending due to RTC HZ Clock Tick.
<29> IS29
OS Timer Match Register 3 Interrupt Pending
0 – Interrupt NOT pending due to OS Timer Match Register 3.
1 – Interrupt pending due to OS Timer Match Register 3.
<28> IS28
OS Timer Match Register 2 Interrupt Pending
0 – Interrupt NOT pending due to OS Timer Match Register 2.
1 – Interrupt pending due to OS Timer Match Register 2.
<27> IS27
OS Timer Match Register 1 Interrupt Pending
0 – Interrupt NOT pending due to OS Timer Match Register 1.
1 – Interrupt pending due to OS Timer Match Register 1.
<26> IS26
OS Timer Match Register 0 Interrupt Pending
0 – Interrupt NOT pending due to OS Timer Match Register 0.
1 – Interrupt pending due to OS Timer Match Register 0.
<25> IS25
DMA Channel Service Request Interrupt Pending
0 – Interrupt NOT pending due to DMA Channel Service Request.
1 – Interrupt pending due to DMA Channel Service Request.
<24> IS24
SSP Service Request Interrupt Pending
0 – Interrupt NOT pending due to SSP Service Request.
1 – Interrupt pending due to SSP Service Request.
<23> IS23
MMC Status/Error Detection Interrupt Pending
0 – Interrupt NOT pending due to MMC Status/Error Detection.
1 – Interrupt pending due to MMC Status/Error Detection.