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12.4.3
Sample Setup Procedure for Normal Pulse Output
Figure 12.4 shows a sample procedure for setting up normal pulse output.
TPU setup
Port and
PPG setup
TPU setup
Figure 12.4 Setup Procedure for Normal Pulse Output (Example)
Rev. 1.0, 09/02, page 274 of 568
Normal PPG output
Select TGR functions
Set TGRA value
Set counting operation
Select interrupt request
Set initial output data
Enable pulse output
Select output trigger
Set next pulse
output data
Start counter
No
Compare match?
Yes
Set next pulse
output data
[1] Set TIOR to make TGRA an output
compare register (with output
disabled)
[1]
[2] Set the PPG output trigger period
[2]
[3] Select the counter clock source with
bits TPSC2 to TPSC0 in TCR.
[3]
Select the counter clear source with
bits CCLR1 and CCLR0.
[4]
[4] Enable the TGIA interrupt in TIER.
The DTC can also be set up to
transfer data to NDR.
[5]
[5] Set the initial output values in
[6]
PODR.
[6] Set the DDR and NDER bits for the
[7]
pins to be used for pulse output to 1.
[7] Select the TPU compare match
[8]
event to be used as the output
trigger in PCR.
[8] Set the next pulse output values in
[9]
NDR.
[9] Set the CST bit in TSTR to 1 to start
the TCNT counter.
[10] At each TGIA interrupt, set the next
output values in NDR.
[10]
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