HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 307

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

When GR Settings are Outside the Count Range (H'0000–GRA3): Waveforms with a duty
cycle of 0% and 100% can be output by setting GR outside the count area. Be sure to make the
direction of the count (increment/decrement) when writing a setting from outside the count area
into the buffer register (BR) the same as the count direction when writing the setting that returns to
within the count area in BR.
The above settings are made by detecting the occurrence of a GRA3 compare match or underflow
of TCNT4 and then writing to BR. They can also be accomplished by starting the DMAC with a
GRA3 compare match.
Output pin
Output pin
H' 0000
GRA3
H' FFFF
H' 0000
Figure 10.41 Example of Changing GR Settings with Buffer Operation (2)
Figure 10.40 Caution on Changing GR Settings with Buffer Operation (2)
GR
GR
BR
TCNT4
T – 1
T
Write on decrement
0% duty
Section 10 16-Bit Integrated Timer Pulse Unit (ITU)
TCNT3
Write on increment
Rev. 7.00 Jan 31, 2006 page 281 of 658
100% duty
Changes prohibited
REJ09B0272-0700