M16CSLASH62M datasheet(124/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timers’ functions for three-phase motor control

1-105

Sawtooth modulation

To generate a PWM waveform of sawtooth wave modulation, set “1” in the modulation mode select bit (bit

6 at 034816). Also, set “0” in the timers A4-1, A1-1, and A2-1 control bit (bit 1 at 034916). In this mode, the

timer registers of timers A4, A1, and A2 comprise conventional timers A4, A1, and A2 alone, and reload

the corresponding timer register’s content to the counter every time the timer B2 counter’s content be-

comes 000016. The effective interrupt output specification bit (bit 1 at 034816) and the effective interrupt

output polarity select bit (bit 0 at 034816) go nullified.

An example of U phase waveform is shown in Figure 1.15.8, and the description of waveform output

workings is given below. Set “1” in DU0 (bit 0 at 034A16), and set “0” in DUB0 (bit 1 at 034A16). In addition,

set “0” in DU1 (bit 0 at 034A16) and set “1” in DUB1 (bit 1 at 034A16).

When the timber B2 counter’s content becomes 000016, timer B2 generates an interrupt, and timer A4

starts outputting one-shot pulses at the same time. In this instance, the contents of the three-phase buffer

registers DU1 and DU0 are set in the three-phase output shift register (U phase), and the contents of

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DUB1 and DUB0 are set in the three-phase output shift register (U phase). After this, the three-phase

buffer register’s content is set in the three-phase shift register every time the timer B2 counter’s content

becomes 000016.

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The value of DU0 and that of DUB0 are output to the U terminal (P80) and to the U terminal (P81)

respectively. When the timer A4 counter counts the value written to timer A4 (038F16, 038E16) and when

timer A4 finishes outputting one-shot pulses, the three-phase output shift register’s content is shifted one

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position, and the value of DU1 and that of DUB1 are output to the U phase output signal and to the U

output signal respectively. At this time, one-shot pulses are output from the timer for setting dead time

used for setting the time over which the “L” level of the U phase waveform doesn’t lap over the “L” level of

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the U phase waveform, which has the opposite phase of the former. The U phase waveform output that

started from the “H” level keeps its level until the timer for setting dead time finishes outputting one-shot

pulses even though the three-phase output shift register’s content changes from “1” to “0 ”by the effect of

the one-shot pulses. When the timer for setting dead time finishes outputting one-shot pulses, 0 already

shifted in the three-phase shift register goes effective, and the U phase waveform changes to the “L”

level. When the timer B2 counter’s content becomes 000016, the contents of the three-phase buffer

registers DU1 and DU0 are set in the three-phase output shift register (U phase), and the contents of

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DUB1 and DUB0 are set in the three-phase output shift register (U phase) again.

A U phase waveform is generated by these workings repeatedly. With the exception that the three-phase

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output shift register on the U phase side is used, the workings in generating a U phase waveform, which

has the opposite phase of the U phase waveform, are the same as in generating a U phase waveform. In

this way, a waveform can be picked up from the applicable terminal in a manner in which the “L” level of

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the U phase waveform doesn’t lap over that of the U phase waveform, which has the opposite phase of

the U phase waveform. The width of the “L” level too can be adjusted by varying the values of timer B2

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and timer A4. In dealing with the V and W phases, and V and W phases, the latter are of opposite phase

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of the former, have the corresponding timers work similarly to dealing with the U and U phases to gener-

ate an intended waveform.

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Setting “1” both in DUB0 and in DUB1 provides a means to output the U phase alone and to fix the U

phase output to “H” as shown in Figure 1.15.9.

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