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6-1 Introduction
When writing and debugging a program, the timing of various operations
must be considered. Not only is the time required to execute the program
and perform other CPU operations important, but also the timing of each sig-
nal coming into and leaving the PC must be such that the desired control ac-
tion is achieved at the right time.
The major factors in determining program timing are the cycle time and the
I/O response time. One cycle of CPU operation is called a cycle; the time
required for one cycle is called the cycle time. The time required to produce a
control output signal following reception of an input signal is called the I/O
response time. This section explains the cycle and shows how to calculate
the cycle time and I/O response time.
Introduction Section 6-1