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ARM DUI 0224F Copyright © 2003-2007 ARM Limited. All rights reserved. 4-85
4.18 Real Time Clock, RTC
The PrimeCell Real Time Clock Controller (RTC) is an AMBA compliant SoC
peripheral that is developed, tested, and licensed by ARM Limited.
A counter in the RTC is incremented every second. The RTC can therefore be used as a
basic alarm function or long time-base counter.
The current value of the clock can be read at any time or the RTC can be programmed
to generate an interrupt after counting for a programmed number of seconds. The
interrupt can be masked by writing to the interrupt match set or clear register.
Note
There is also a separate Time-of-Year RTC implemented in an external DS1338 chip on
the PB926EJ-S. The external RTC can be accessed by the serial bus interface (see Serial
bus interface on page 4-86). For details on the programming interface to the
Time-of-Year RTC, see the datasheet for the Maxim DS1338 integrated circuit.
Table 4-59 RTC implementation
Property Value
Location ARM926EJ-S PXP Development Chip
Memory base address
0x101E8000
Interrupt 10 on the primary controller
DMA NA
Release version ARM RTC PL031 r1p0
Reference documentation ARM PrimeCell Real Time Clock Controller (PL031) Technical
Reference Manual