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Chapter 40 Pulse Frequency Modulator
3.Reload Counter Operation
● Counter state transitions
Figure 3-3 Counter State Transitions
Reset
State transitions by hardware
State transitions by register access
Counter: Stores the value when
counting stopped.
Indeterminate after a reset.
Counter: Stores the value when
counting stopped.
Indeterminate aftera reset
until loaded.
Counter: Running
Load contents of the reload
register to the counter.
Load complete
CNTE= "0"
CNTE= "1"
CNTE= "1"
CNTE= "0"
TRG= "0"
TRG= "1"
TRG= "1"
TRG= "1"
RELD
•
UF
STOP
WAIT
RUN
CNTE= "0", WAIT= "1"
CNTE= "1", WAIT="1"
CNTE= "1", WAIT= "0"
LOAD
RELD
•
UF
CNTE= "1", WAIT= "0"