M32CSLASH8A datasheet(210/372 Pages) RENESAS

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M32C/8A Group

16. Three-Phase Motor Control Timer Function

Rev.1.00

Jul 15, 2007

Page 193 of 352

REJ09B0385-0100

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. One timer

Ai one-shot pulse 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

× (m + 1)

× ak

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