Normal Pulse Output - Hitachi H8S/2646 Hardware Manual

11.3.3

Normal Pulse Output

Sample Setup Procedure for Normal Pulse Output: Figure 11-4 shows a sample procedure for
setting up normal pulse output.
TPU setup
Set counting operation
Select interrupt request
Set initial output data
Port and
PPG setup
TPU setup
Figure 11-4 Setup Procedure for Normal Pulse Output (Example)
Normal PPG output
Select TGR functions
Set TGRA value
Enable pulse output
Select output trigger
Set next pulse
output data
Start counter
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
[5]
transfer data to NDR.
[6]
[5] Set the initial output values in
PODR.
[7]
[6] Set the DDR and NDER bits for the
pins to be used for pulse output to 1.
[8]
[7] Select the TPU compare match
event to be used as the output
[9]
trigger in PCR.
No [8] Set the next pulse output values in
NDR.
[9] Set the CST bit in TSTR to 1 to
[10] start the TCNT counter.
[10] At each TGIA interrupt, set the next
output values in NDR.
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