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M16C/5L Group, M16C/56 Group
17.3.4
Sawtooth Wave Modulation Mode
In this mode, the sawtooth wave is modulated. Table 17.15 lists Sawtooth Wave Modulation Mode
Specifications, and Figure 17.9 shows Example of Sawtooth Wave Modulation Mode Operation.
Table 17.15
Sawtooth Wave Modulation Mode Specifications
Item
Carrier wave cycle
Three-phase PWM output width n: Setting value of the TAi register, 0001h to FFFFh
Reference cycle
Timer B2 reload timing
Three-phase PWM
waveform control
Timer B2 interrupt
Dead time timer trigger
Detection of a carrier
wave cycle
(first half or last half)
i = 1, 2, 4
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
m
+
1
------------- -
fi
m: Setting value of the TB2 register, 0000h to FFFFh
fi: Count source frequency (f1TIMAB, f2TIMAB, f8TIMAB, f32TIMAB,
f64TIMAB, fOCO-F, fOCO-S, fC32)
n
-- -
fi
fi: Count source frequency (f1TIMAB, f2TIMAB, f8TIMAB, f32TIMAB,
f64TIMAB, fOCO-F, fOCO-S, fC32)
Timer B2 cycle (cycle of the carrier wave)
Timer B2 underflow
Counts the value of the TAi register every time a timer Ai start trigger is
generated (the TAi1 register is not used).
The output levels set in registers IDB0 and IDB1 are transferred to the
three-phase output shift register at every timer B2 underflow.
When the setting value in the ICTB2 register is n, a timer B2 interrupt
request is generated every nth time of timer B2 underflow (not
influenced by bits INV00 and INV01 in the INVC0 register).
Both of the following:
•
Transfer trigger (generated at every timer B2 underflow)
•
Falling edge of timer Ai one-shot pulse
-
17. Three-Phase Motor Control Timer Function
Specification
Page 337 of 803
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