Section 10 Programmable Pulse Generator (PPG)
Rev. 3.00 Mar. 14, 2006 Page 358 of 804
REJ09B0104-0300
10.4.3
Example of Normal Pulse Output (Example of 5-Phase Pulse Output)
Figure 10.5 shows an example in which pulse output is used for cyclic 5-phase pulse output.
TCNT value
TCNT
TGRA
H'0000
NDRH
00
80
C0
40
60
20
30
10
18
08
88
PODRH
PO15
PO14
PO13
PO12
PO11
Time
Compare match
C0
80
C0
80
40
60
20
30
10
18
08
88
80
C0
40
Figure 10.5 Normal Pulse Output Example (5-Phase Pulse Output)
1. Set up TGRA in TPU which is used as the output trigger to be an output compare register. Set
a cycle in TGRA so the counter will be cleared by compare match A. Set the TGIEA bit in
TIER to 1 to enable the compare match/input capture A (TGIA) interrupt.
2. Write H'F8 to NDERH, and set bits G3CMS1, G3CMS0, G2CMS1, and G2CMS0 in PCR to
select compare match in the TPU channel set up in the previous step to be the output trigger.
Write output data H'80 in NDRH.
3. The timer counter in the TPU channel starts. When compare match A occurs, the NDRH
contents are transferred to PODRH and output. The TGIA interrupt handling routine writes the
next output data (H'C0) in NDRH.
4. 5-phase pulse output (one or two phases active at a time) can be obtained subsequently by
writing H'40, H'60, H'20, H'30, H'10, H'18, H'08, H'88... at successive TGIA interrupts.
If the DMAC is set for activation by the TGIA interrupt, pulse output can be obtained without
imposing a load on the CPU.
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