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TIMER/COUNTER UNIT
Start
No
No
Timer Input
at High Level
?
Yes
Prescaler On
(P = 1)
?
Yes
Did Timer 2
Reach Maxcount
Last Service
State
?
No
Done
9-4
Timer
Enabled
(EN = 1)
?
Yes
External
No
Clocking
(EXT = 1)
?
Yes
Retrigger
(RTG = 1)
?
Lo to Hi
transition on input
pin since last
service
?
No
No
Yes
Increment
Counter
Continued
"A"
Figure 9-3. Timers 0 and 1 Flow Chart
No
Done
Yes
Lo to Hi
Yes
transition on input
pin since last
service
?
Clear Count
Register
Done
Yes
No
A1294-0A
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