Fujitsu FR81S 用户手册
CHAPTER 19: BASE TIMER
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: BASE TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
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Output Waveform
The waveform (TOUT signal) of the 16/32-bit reload timer can be output. The waveform (TOUT signal) to be
output varies according to the setting of the OSEL bit of the base timer x timer control register (BTxTMCR).
Table 5-1 Correspondence between Output Polarities and Output Waveforms
Output polarity
Output waveform
Normal polarity
(OSEL = 0)
"L" level pulse is output when counting starts.
Thereafter, the output level is inverted every time an underflow occurs.
Inverted polarity
(OSEL = 1)
"H" level pulse is output when counting starts.
Thereafter, the output level is inverted every time an underflow occurs.
Figure 5-8 shows the output waveform in reload mode.
Figure 5-8 Output Waveform in Reload Mode (Normal Polarity)
TI O A0, TIOA1 pins
CTEN bit
Opposite (Inversion) level when OSEL=1
Activation trigger
Underflow
MB91520 Series
MN705-00010-1v0-E
685