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Intel® PXA255 Processor Developer’s Manual 4-45
System Integration Unit
4.6.2 Interrupt Controller Register Locations
Table 4-50 shows the registers associated with the interrupt controller block and their physical
addresses.
4.6.3 Real-Time Clock Register Locations
Table 4-51 describes the location of the RTC registers.
4.6.4 OS Timer Register Locations
Table 4-52 shows the registers associated with the OS timer and the physical addresses used to
access them.
0x40E0_0060 GAFR1_U
GPIO alternate function select register
GPIO[63:48]
0x40E0_0064 GAFR2_L
GPIO alternate function select register
GPIO[79:64]
0x40E0_0068 GAFR2_U GPIO alternate function select register GPIO[80]
Table 4-49. GPIO Register Addresses (Sheet 2 of 2)
Table 4-50. Interrupt Controller Register Addresses
Address Name Description
0x40D0_0000 ICIP Interrupt controller IRQ pending register
0x40D0_0004 ICMR Interrupt controller mask register
0x40D0_0008 ICLR Interrupt controller level register
0x40D0_000C ICFP Interrupt controller FIQ pending register
0x40D0_0010 ICPR Interrupt controller pending register
0x40D0_0014 ICCR Interrupt controller control register
Table 4-51. RTC Register Addresses
Address Name Description
0x4090_0000 RCNR RTC count register
0x4090_0004 RTAR RTC alarm register
0x4090_0008 RTSR RTC status register
0x4090_000C RTTR RTC trim register
Table 4-52. OS Timer Register Addresses (Sheet 1 of 2)
Address Name Description
0x40A0_0000 OSMR0 OS timer match register 0
0x40A0_0004 OSMR1 OS timer match register 1
0x40A0_0008 OSMR2 OS timer match register 2