Example Of Normal Pulse Output (Example Of 5-Phase Pulse Output); Figure 10.5 Normal Pulse Output Example (5-Phase Pulse Output) - Renesas H8SX/1520 Series Hardware Manual

Section 10 Programmable Pulse Generator (PPG)
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
TGRA
H'0000
NDRH
PODRH 00
PO15
PO14
PO13
PO12
PO11

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.
Rev. 3.00 Mar. 14, 2006 Page 358 of 804
REJ09B0104-0300
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Compare match
TCNT
80 C0 40 60
80 C0 40
20 30 10 18
60 20 30 10
08 88 80 C0
18 08 88 80
Time
40
C0