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9.3.4 Non-Overlapping TPC Output
Sample Setup Procedure for Non-Overlapping TPC Output: Figure 9-6 shows a sample
procedure for setting up non-overlapping TPC output.
ITU setup
Select counting operation
Select interrupt requests
Set initial output data
Enable TPC transfer
Port and
TPC setup
Select TPC transfer trigger
Select non-overlapping groups
Set next TPC output data
ITU setup
Set next TPC output data
Figure 9-6 Setup Procedure for Non-Overlapping TPC Output (Example)
306
Non-overlapping
TPC output
Select GR functions
Set GR values
Set up TPC output
Start counter
Compare match A?
Yes
1
1.
Set TIOR to make GRA and GRB output
compare registers (with output inhibited).
2.
Set the TPC output trigger period in GRB
2
and the non-overlap margin in GRA.
3.
Select the counter clock source with bits
3
TPSC2 to TPSC0 in TCR. Select the counter
clear source with bits CCLR1 and CCLR0.
4
4.
Enable the IMFA interrupt in TIER.
5.
Set the initial output values in the DR bits
of the input/output port pins to be used for
5
TPC output.
6.
Set the DDR bits of the input/output port pins
6
to be used for TPC output to 1.
7.
Set the NDER bits of the pins to be used for
TPC output to 1.
7
8.
In TPCR, select the ITU compare match
event to be used as the TPC output trigger.
8
9.
In TPMR, select the groups that will operate
in non-overlap mode.
9
10.
Set the next TPC output values in the NDR
bits.
11.
Set the STR bit to 1 in TSTR to start the timer
10
counter.
12.
At each IMFA interrupt, write the next output
value in the NDR bits.
11
No
12
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