HD6432351 datasheet(563/1025 Pages) RENESAS

563 / 1025 page

Section 11 Programmable Pulse Generator (PPG)

Rev. 3.00 Sep 15, 2006 page 529 of 988

REJ09B0330-0300

11.4

Usage Notes

Operation of Pulse Output Pins

Pins PO0 to PO15 are also used for other peripheral functions such as the TPU. When output by

another peripheral function is enabled, the corresponding pins cannot be used for pulse output.

Note, however, that data transfer from NDR bits to PODR bits takes place, regardless of the usage

of the pins.

Pin functions should be changed only under conditions in which the output trigger event will not

occur.

Note on Non-Overlapping Output

During non-overlapping operation, the transfer of NDR bit values to PODR bits takes place as

follows.

• NDR bits are always transferred to PODR bits at compare match A.

• At compare match B, NDR bits are transferred only if their value is 0. Bits are not transferred

if their value is 1.

Figure 11.10 illustrates the non-overlapping pulse output operation.

Compare match A

Compare match B

Pulse

output

Normal output/

inverted output

PODR

NDER

NDR

Internal data bus

DDR

Figure 11.10 Non-Overlapping Pulse Output

Therefore, 0 data can be transferred ahead of 1 data by making compare match B occur before

compare match A. The NDR contents should not be altered during the interval from compare

match B to compare match A (the non-overlap margin).

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