Example Of Normal Pulse Output (Example Of Five-Phase Pulse Output); Figure 12.5 Normal Pulse Output Example (Five-Phase Pulse Output) - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Section 12 Programmable Pulse Generator (PPG)

Example of Normal Pulse Output (Example of Five-Phase Pulse Output)

Figure 12.5 shows an example in which pulse output is used for cyclic five-phase pulse output.

1. Set up TGRA of the TPU that is used as the output trigger to be an output compare register. Set

a frequency in TGRA so the counter will be cleared on compare match A. Set the TGIEA bit

of TIER to 1 to enable the compare match/input capture A (TGIA) interrupt.

2. Write H'F8 in P1DDR and NDERH, and set the G3CMS0, G3CMS1, G2CMS0, and G2CMS1

bits 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. 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. Five-phase overlapping 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 DTC is set for activation by this interrupt, pulse output can be obtained

without imposing a load on the CPU.

Rev. 6.00 Mar 15, 2006 page 294 of 570

REJ09B0211-0600

Compare match