Mips Technologies R4000 - Compare Register (11)

Chapter 5
104 MIPS R4000 Microprocessor User's Manual
Compare Register (11)
The Compare register acts as a timer (see also the Count register); it
maintains a stable value that does not change on its own.
When the value of the Count register equals the value of the Compare
register, interrupt bit IP(7) in the Cause register is set. This causes an
interrupt as soon as the interrupt is enabled.
Writing a value to the Compare register, as a side effect, clears the timer
interrupt.
For diagnostic purposes, the Compare register is a read/write register. In
normal use however, the Compare register is write-only. Figure 5-4 shows
the format of the Compare register.
Figure 5-4 Compare Register Format
Compare Register
31 0
32
Compare