D12320VF25IV Datasheet, PDF (580/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 11 Programmable Pulse Generator (PPG)
Example of Normal Pulse Output (Example of Five-Phase Pulse Output): Figure 11.5 shows
an example in which pulse output is used for cyclic five-phase pulse output.
TCNT value
TGRA
TCNT
Compare match
H'0000
NDRH
Time
80 C0 40 60 20 30 10 18 08 88 80 C0 40
PODRH 00 80 C0 40 60 20 30 10 18 08 88 80 C0
PO15
PO14
PO13
PO12
PO11
Figure 11.5 Normal Pulse Output Example (Five-Phase Pulse Output)
[1] Set up the TPU channel to be used as the output trigger channel so that TGRA is an output
compare register and the counter will be cleared by compare match A. Set the trigger period in
TGRA and set the TGIEA bit in TIER to 1 to enable the compare match A (TGIA) interrupt.
[2] Write H'F8 in P1DDR and NDERH, and set the G3CMS1, G3CMS0, G2CMS1, and G2CMS0
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] 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] 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 or DMAC* is set for activation by this interrupt, pulse output can be
obtained without imposing a load on the CPU.
Note: * The DMAC is not supported in the H8S/2321.
Rev.6.00 Sep. 27, 2007 Page 548 of 1268
REJ09B0220-0600