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Chapter 37 Output Compare
7.Q & A
7. Q & A
7.1 How do I set the compare value?
Write the compare value to compare registers OCCP0 - OCCP7.
7.2 How do I set the compare mode? (for OCU1, OCU3, OCU5, OCU7 output)
This is done using compare mode bits (OCS01.CMOD), (OCS23.CMOD), (OCS45.CMOD), (OCS67.CMOD).
To reverse OCU1 output using a compare-match from only free-run timer 2
and compare register 1
To reverse OCU3 output using a compare-match from only free-run timer 3
and compare register 3
To reverse OCU5 output using a compare-match from only free-run timer 6
and compare register 5
To reverse OCU7 output using a compare-match from only free-run timer 7
and compare register 7
To reverse OCU1 output using a compare-match from free-run timer 2 and
compare register 0, as well as free-run timer 0 and compare register 1
To reverse OCU3 output using a compare-match from free-run timer 3 and
compare register 2, as well as free-run timer 1 and compare register 3
To reverse OCU5 output using a compare-match from free-run timer 6 and
compare register 4, as well as free-run timer 4 and compare register 1
To reverse OCU7 output using a compare-match from free-run timer 7 and
compare register 6, as well as free-run timer 5 and compare register 3
With no relation to CMOD bit,
OCU0 output is reversed by a compare-match between free-run timer 2 and compare register 0 only.
OCU2 output is reversed by a compare-match between free-run timer 3 and compare register 2 only.
OCU4 output is reversed by a compare-match between free-run timer 6 and compare register 4 only.
OCU6 output is reversed by a compare-match between free-run timer 7 and compare register 6 only.
7.3 How do I enable/disable the compare operation?
Set it via the compare operation permission bit (OCS01.CST[1:0]), (OCS23.CST[1:0]), (OCS45.CST[1:0]),
(OCS67.CST[1:0]).
Operation
To stop (disable) the compare operation
768
Operation
Compare mode bit
Set (OCS01.CMOD) bit to "0"
Set (OCS23.CMOD) bit to "0"
Set (OCS45.CMOD) bit to "0"
Set (OCS67.CMOD) bit to "0"
Set (OCS01.CMOD) bit to "1"
Set (OCS23.CMOD) bit to "1"
Set (OCS45.CMOD) bit to "1"
Set (OCS67.CMOD) bit to "1"
Compare
Compare operation permission bit
Compare 0
Set (OCS01.CST[0]) to "0"
Compare 1
Set (OCS01.CST[1]) to "0"
Compare 2
Set (OCS23.CST[0]) to "0"
Compare 3
Set (OCS23.CST[1]) to "0"
Compare 4
Set (OCS45.CST[0]) to "0"
Compare 5
Set (OCS45.CST[1]) to "0"
Compare 6
Set (OCS67.CST[0]) to "0"
Compare 7
Set (OCS67.CST[1]) to "0"
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