SH7101 datasheet(409/560 Pages) RENESAS

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Section 13 Motor Management Timer (MMT)

Rev.1.00 Sep. 18, 2008 Page 375 of 522

REJ09B0069-0100

Table 13.2

Initial Values of TBRU to TBRW and Initial Output

Initial Output

Initial Value of TBRU to TBRW

OLSP = 1, OLSN = 1

OLSP = 0, OLSN = 0

TBR = H'0000

Positive phase: 1

Negative phase: 0

Positive phase: 0

Negative phase: 1

H'0000 < TBR

≤ Td

Positive phase: 0

Negative phase: 0

Positive phase: 1

Negative phase: 1

Td < TBR

≤ H'FFFF – 2Td

Positive phase: 0

Negative phase: 1

Positive phase: 1

Negative phase: 0

(9) PWM Output Generation in Operating Modes

In the operating modes, a three-phase PWM waveform is output with a non-overlap relationship

between the positive and negative phases. This non-overlap time is called the dead time.

The PWM waveform is generated from an output generation waveform generated by ANDing the

compare output waveform with the dead time generation waveform. Waveform generation for one

phase (the U-phase) is shown here. The V-phase and W-phase waveforms are generated in the

same way.

(a) Compare Output Waveform

The compare output waveform is generated by comparing the values in TCNT and TGR.

For compare output waveform U phase A (CMOUA), 0 is output if TGRUU > TCNT in the T1

interval (when TCNT is counting up), and 1 is output if TGRUU

≤ TCNT. In the T2 interval

(when TCNT is counting down), 0 is output if TGRU > TCNT, and 1 is output if TGRU

≤ TCNT.

For compare output waveform U phase B (CMOUB), 1 is output if TGRU > TCNT in the T1

interval, and 0 is output if TGRU

≤ TCNT. In the T2 interval, 1 is output if TGRUD > TCNT, and

0 is output if TGRUD

≤ TCNT.

(b) Dead Time Generation Waveform

For dead time generation waveform U phases A (DTGUA) and B (DTGUB), 1 is output as the

initial value.

TDCNT0 starts counting at the falling edge of CMOUA. DTGUA outputs 0 if TDCNT0 is

counting, and 1 otherwise.

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