M16CSLASH26 datasheet(109/239 Pages) RENESAS

109 / 239 page

Renesas Technology Corp.

Three-Phase Motor Control Timer Function

103

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Timer A4 output

Trigger signal for

timer Ai start

(timer B2 overflow

signal)

Timer B2

U phase

Carrier wave

Signal wave

U phase

output signal

Control signal for

timer A4 reload

U phase

output signal

Note 1: When INV14="0" (output wave Low active)

Note 2: When INV14="1" (output wave High active)

Note 3: Set to triangular wave modulation mode and to three-phase mode 1.

INV13(Triangular wave

modulation detect flag)

(Note 1)

(Note 2)

(Note 3)

U phase

Dead time

Timber B2 interrupt occurres

Rewriting timer A4 and timer A4-1.

Possible to set the number of overflows to generate an

interrupt by use of the interrupt occurrences frequency

set circuit

The three-phase

shift register

shifts in

synchronization

with the falling

edge of the A4

output.

Figure 1.14.8. Timing chart of operation (1)

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 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, timer A4, and timer A4-1. In dealing with the V and W phases, and V and W phases,

the latter are of opposite phase of the former, have the corresponding timers work similarly to dealing with

the U and U phases to generate an intended waveform.

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