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R8C/38T-A Group
17. Timer RC
Under development Preliminary document
Specifications in this document are tentative and subject to change.
R01UH0241EJ0010 Rev.0.10
Page 318 of 730
Aug 05, 2011
When the TRCIOB pin is pulled up externally, the OPE bit in the TRCOPR register is 1 (output waveform
manipulation enabled), bits OPOL1 and OPOL0 are 01b (when pins TRCIOA, TRCIOB, TRCIOC, and
TRCIOD are set to be pulled up externally, timer RC output level is fixed to high impedance during output
waveform manipulation period), and the RESTATS bit is 0 (output waveform manipulation is stopped by
software and output is restarted)
Figure 17.24
Operation Example of Output Waveform Manipulation (2)
When the OPE bit in the TRCOPR register is 1 (output waveform manipulation enabled), bits OPOL1 and
OPOL0 are 10b (timer RC output level is fixed low during output waveform manipulation period), and the
RESTATS bit is 1 (automatic output waveform manipulation is stopped by software and automatic output is
restarted)
Figure 17.25
Operation Example of Output Waveform Manipulation (3)
Output waveform manipulation
event is cancelled
Output waveform manipulation
event is input
Waveforms less than one
cycle are not output
During output waveform manipulation
period, timer RC output level is fixed
to high impedance, and fixed high
when TRCIOB pin is set to be pulled
up externally
Output waveform manipulation
is stopped by software and
output is restarted
Output waveform
manipulation event
Timer RC output
TRCIOB_XP (internal signal)
EB bit in
TRCOER register
Corresponding output with
output waveform
manipulation disabled
Output control signal
TRCOAE_XN
(internal signal)
TRCIOB output
Output waveform manipulation
event is cancelled
Output waveform
manipulation event
Output waveform manipulation
event is input
Waveforms less than one
cycle are not output
During output waveform
manipulation period,
timer RC output level is fixed low
When output waveform
manipulation event is cancelled,
EB bit is set to 0
Timer RC output
TRCIOB_XP (internal signal)
EB bit in
TRCOER register
Corresponding output with
output waveform
manipulation disabled
Output control signal
TRCOAE_XN
(internal signal)
TRCIOB output
Output is enabled