M16C65 Datasheet, PDF (431/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
19. Three-Phase Motor Control Timer Function
19.3.4 Sawtooth Wave Modulation Mode
The sawtooth wave is modulated. Table 19.15 lists Sawtooth Wave Modulation Mode Specifications,
and Figure 19.9 shows Usage Example of Sawtooth Wave Modulation Mode.
Table 19.15 Sawtooth Wave Modulation Mode Specifications
Item
Specification
Carrier wave cycle
m_{-------+-----}1_--
fi
m: Setting value of the TB2 register, 0 to FFFFh
fi: Count source frequency (f1TIMAB, f2TIMAB, f8TIMAB, f32TIMAB,
f64TIMAB, fOCO-F, fOCO-S, fC32)
Three-phase PWM output width
n_--
fi
n: Setting value of the TAi register, 1 to FFFFh
fi: Count source frequency (f1TIMAB, f2TIMAB, f8TIMAB, f32TIMAB,
f64TIMAB, fOCO-F, fOCO-S, fC32)
Differences Reference cycle
from
Timer B2 reload timing
triangular _{Three-phase PWM}
wave
waveform control
modulation
mode
Timer B2 cycle (one-half cycle of the carrier wave)
Timer B2 underflow
Counts the value of the TAi register every time the 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.
Timer B2 interrupt
When the setting value in the ICTB2 register is n, the timer B2
interrupt request is generated every nth time of timer B2 underflow
(no bits INV00 and INV01 in the INVC1 register).
Dead time timer trigger Both of the following:
• Transfer trigger (generated at every timer B2 underflow)
• Falling edge of timer Ai one-shot pulse
Detection of a carrier -
wave cycle
(first half or last half)
i = 1, 2, 4
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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