Hitachi H8/3060, Hardware Manual

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10.3.3 Normal TPC Output
Sample Setup Procedure for Normal TPC Output: Figure 10.4 shows a sample procedure for
setting up normal TPC output.
Normal TPC output
Set next TPC output data
Compare match?
No
Yes
Set next TPC output data
16-bit timer
setup
16-bit timer
setup
Port and
TPC setup
10
11
9
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Set TIOR to make GRA an output compare
register (with output inhibited).
Set the TPC output trigger period.
Select the counter clock source with bits
TPSC2 to TPSC0 in TCR. Select the
counter clear source with bits CCLR1 and
CCLR0.
Enable the IMFA interrupt in TISRA.
Set the initial output values in the DR bits
of the input/output port pins to be used for
TPC output.
Set the DDR bits of the input/output port
pins to be used for TPC output to 1.
Set the NDER bits of the pins to be used
for TPC output to 1.
Select the 16-bit timer compare match
event to be used as the TPC output trigger
in TPCR.
Set the next TPC output values in the NDR
bits.
Set the STR bit to 1 in TSTR to start the
timer counter.
At each IMFA interrupt, set the next output
values in the NDR bits.
1
2
3
4
5
6
7
8
Select GR functions
Set GRA value
Select counting operation
Select interrupt request
Start counter
Set initial output data
Select port output
Enable TPC output
Select TPC output trigger
Figure 10.4 Setup Procedure for Normal TPC Output (Example)