M32CSLASH8B datasheet(210/406 Pages) RENESAS

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Under development

M32C/8B Group

16. Three-Phase Motor Control Timer Function

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 193 of 385

16.2

Sawtooth Wave Modulation Mode

In sawtooth wave modulation mode, one cycle of carrier waveform consists of one timer B2 underflow cycle.

A timer Ai one-shot pulse (i = 1, 2, and 4) is generated by using a timer B2 underflow signal as a trigger. Single

one-shot pulse from timer Ai is used to output one cycle of the PWM waveform. Table 16.4 lists specifications and

settings of sawtooth wave modulation mode.

Table 16.4

Specifications and Settings of Sawtooth Wave Modulation Mode

m: Value of the TB2 register

ak: Value set to the TAi register at k-th time.

Item

Three-Phase Mode 0

INV06 bit

INV11 bit

Bits INV01 and INV00

00b or 01b

PWCON bit

ICTB2 register

INV16 bit

Carrier wave cycle

Upper arm active level output

width

Timer B2 interrupt generation

timing

Every n-th timer B2 underflow

Timer B2 reload timing

Timer B2 underflow

Transfer timing from IDBp

shift register (p = 0, 1)

Every time a transfer trigger occurs.

Dead time timer start timing

• At the falling edge of the one-shot pulse of timer A1, A2 and A4

• Transfer trigger

× (m + 1)

× ak

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