Specifications

Real-Time Clock (RTC)
ARM DDI 0287B Copyright © 2004, 2006 ARM Limited. All rights reserved. 11-3
11.2 Functional description
The release version used is PL031 RTC 1v0. The base address for the RTC control
registers is
0x101E8000 . For more information on the controller, see the ARM PrimeCell
Timer Module (SP804) Technical Reference Manual.
The PrimeCell RTC can be used to provide a basic alarm function or long time base
counter. This is achieved by generating an interrupt signal after counting for a
programmed number of cycles of a real-time clock input. Counting in one second
intervals is achieved by use of a 1Hz clock input to the PrimeCell RTC. Figure 11-1
shows the block diagram of the PrimeCell RTC.
Figure 11-1 PrimeCell RTC
PL031 RTC
ARM926EJ-S Dev. Chip
RTCINTR
CLK1HZ
Bus interface
Counter
block
Register,
control,
and update
blocks
nRTCRST