Kontron PB-TIM2 - Manual (Page 14)

Chapter 2 Functional Description PB-TIM2 User’s Manual
Measure
period
Count up
Stop on
B
Enable
counting
Up =
count
enable
v = stop
counting
Clear
counter/
output
On Bv
Counter
register
Measure
freq.
Count up
Stop on
B
Enable
counting
1v =
count
enable
2v = stop
counting
Clear
counter/
output
On 2nd
Bv
Counter
register
Generate
freq.
Count-
down
Load at 0
Half
period
Enable
counting
Ring
counting
Clear
counter/
output/
Ring
mode
Toggle at
0
1/2
PWM
Count-
down
Stop at
0/ load
on A
Half
cycle
Enable
counting
Load on
edge
Clear
counter/
output
Passive
if 0
Edge
sampling
Count up Enable
counting
Clear
counter/
output
On A
edge
Counter
register
Pulse
duration
Count up Thresh-
old
Enable
counting
Up =
count
enable
Clear
counter/
output
On
match
Counter
register
With reference to table 2.3.1, a ‘v’ on its own represents an edge; 1v indicates the first edge and 2v represents the second
edge.
2.3.1 Hardware Single Shot (Retrigerable)
In this mode, the timer always counts down, the pulse duration is stored in the comparator register and the output acts as
zero detection with input (A) used to load/reload the timer with the preset/comparator register.
2.3.2 Hardware Single Shot
This mode is the same as the one described in 2.3.1 above except that the software starts the period directly by writing the
bits ENABLE and LOAD in the Channel Control Register.
2.3.3 TIC Generation
The period is stored in the preload/comparator register and upon zero detection, the timer is reloaded and an event IRQ is
generated (IRQ plus flag).
Page 2-4 © 1996 PEP Modular Computers July 30, 1997