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A method is described which allows a processor to double its input clock frequency transparently via control by the processor itself.
English (United States)
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Method for Processor to Control Its Input Clock Rate
A method is described which allows a processor to double its input clock
frequency transparently via control by the processor itself.
The method allows a processor to control its input clock rate by driving an
external switch from internal programming. The processor that is capable of
running at the higher clock rate doubles its own input clock frequency by
executing an instruction that is not executed in the slower processor program.
Thus, as the faster processor becomes available for use, no change to the
existing clock logic is required, but simply a programming change.
The arrangement, shown in Fig. 1, uses an external latch 10 to control an
external clock switch 11. It is assumed the power on state of this latch is defined
and can be controlled by the processor via software. The initial condition of the
output gates the slower clock into the processor clock input. The faster
processor software will execute an instruction not executed by the slower
processor to drive the output to the opposite state, switching the control to allow
the faster cloc be gated into the processor clock input. Fig. 1 uses a single clock
source and allows the processor to double its clock frequency. The fast
processor executes an instruction to complement the state of the latch, thereby
gating the fast clock source into the processor's clock input.