M16CSLASH62M datasheet(121/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timers’ functions for three-phase motor control

1-102

Triangular wave modulation

To generate a PWM waveform of triangular wave modulation, set “0” in the modulation mode select bit

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

of timers A4, A1, and A2 has two timer registers, and alternately reloads the timer register’s content to the

counter every time timer B2 counter’s content becomes 000016. If “0” is set to the effective interrupt

output specification bit (bit 1 at 034816), the frequency of interrupt requests that occur every time the timer

B2 counter’s value becomes 000016 can be set by use of the timer B2 counter (034D16) for setting the

frequency of interrupt occurrences. The frequency of occurrences is given by (setting; setting

≠ 0).

Setting “1” in the effective interrupt output specification bit (bit 1 at 034816) provides the means to choose

which value of the timer A1 reload control signal to use, “0” or “1”, to cause timer B2’s interrupt request to

occur. To make this selection, use the effective interrupt output polarity selection bit (bit 0 at 034816).

An example of U phase waveform is shown in Figure 1.15.6, 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 034B16) and set “1” in DUB1 (bit 1 at 034B16). Also, set “0” in the effective

interrupt output specification bit (bit 1 at 034816) to set a value in the timer B2 interrupt occurrence

frequency set counter. By this setting, a timer B2 interrupt occurs when the timer B2 counter’s content

becomes 000016 as many as (setting) times. Furthermore, set “1” in the effective interrupt output specifi-

cation bit (bit 1 at 034816), set “0” in the effective interrupt output polarity select bit (bit 0 at 034816) and set

"1" in the interrupt occurrence frequency set counter (034D16). These settings cause a timer B2 interrupt

to occur every other interval when the U phase output goes to “H”.

When the timer B2 counter’s content becomes 000016, timer A4 starts outputting one-shot pulses. In this

instance, the content of DU1 (bit 0 at 034B16) and that of DU0 (bit 0 at 034A16) are set in the three-phase

output shift register (U phase), the content of DUB1 (bit 1 at 034B16) and that of DUB0 (bit 1 at 034A16)

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are set in the three-phase output shift register (U phase). After triangular wave modulation mode is se-

lected, however, no setting is made in the shift register even though 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 shift register’s content is shifted one posi-

___

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

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

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setting the time over which the “L” level of the U phase waveform does not lap over the “L” level of 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 timer A4 counter starts counting the

value written to timer A4-1 (034716, 034616), and starts outputting one-shot pulses. When timer A4 fin-

ishes outputting one-shot pulses, the three-phase shift register’s content is shifted one position, but if the

three-phase output shift register’s content changes from “0” to “1” as a result of the shift, the output level

changes from “L” to “H” without waiting for the timer for setting dead time to finish outputting one-shot

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

three-phase 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

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