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Figure 19.14. TIMER Period and/or Pulse width Capture
CNT
0
Input
Clear& Start
Input Capture (frequency capture)
Input Capture (pulse-width capture)
19.3.2.4 Compare
Each Compare/Capture channel contains a comparator which outputs a compare match if the contents
of TIMERn_CCx_CCV matches the counter value, see Figure 19.15 (p. 253) . In compare mode, each
compare channel can be configured to either set, clear or toggle the output on an event (compare match,
overflow or underflow). The output from each channel is represented as an alternative function on the
port it is connected to, which needs to be enabled for the CC outputs to propagate to the pins.
Figure 19.15. TIMER Block Diagram Showing Comparison Functionality
Update
Condition
CNTCLK
TIMERn_CNT
TIMERn_TOP
=
Overflow
Note: For sim plicity, all
TIMERn_CCx registers are
grouped together in the figure,
but they all have individual
Com pare Register and logic
= 0
Underflow
Com pare Match x
==
TnCCR1[ 15:0
TIMERn_CCx
TnCCR0[ 15:0
]
]
=
Com pare and
PWM config
Com pare and
PWM config
Com pare and
PWM config
TIMn_CC0
TIMn_CC1
TIMn_CC2
If occurring in the same cycle, match action will have priority over overflow or underflow action.
The input selected (through PRSSEL, INSEL and FILTSEL in TIMERn_CCx_CTRL) for the CC channel
will also be sampled on compare match and the result is found in the CCPOL bits in TIMERn_STATUS.
The COIST bit in TIMERn_CCx_CTRL is the initial state of the compare/PWM output. Also the resulting
output can be inverted by setting OUTINV in TIMERn_CCx_CTRL. It is recommended to turn off the CC
channel before configuring the output state to avoid any pulses on the output. The CC channel can be
turned off by setting MODE to OFF in TIMER_CCx_CTRL.
Figure 19.16. TIMER Output Logic
COIST
OUTINV
Output
Com pare/
PWM x
0
1
TIMn_CCx
2011-04-12 - d0001_Rev1.10
253
www.energymicro.com
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