M16CSLASH62 datasheet(115/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timers’ functions for three-phase motor control

1-96

Timers’ functions for three-phase motor control

Use of more than one built-in timer A and timer B provides the means of outputting three-phase motor

driving waveforms.

Figures 1.15.1 to 1.15.3 show registers related to timers for three-phase motor control.

Three-phase PWM control register 0

Symbol

Address

When reset

INVC0

034816

0016

b4 b3

Effective interrupt output

polarity select bit

INV00

Bit symbol

Bit name

Description

INV01

Effective interrupt output

specification bit

(Note 4)

INV02

Mode select bit

(Note 2)

INV04

Positive and negative

phases concurrent L

output disable function

enable bit

INV07

Software trigger bit

INV06

Modulation mode select

bit (Note 3)

INV05

Positive and negative

phases concurrent L

output detect flag

INV03

Output control

bit

0: A timer B2 interrupt occurs when the timer

A1 reload control signal is “1”.

1: A timer B2 interrupt occurs when the timer

A1 reload control signal is “0”.

Effective only in three-phase mode 1

0: Not specified.

1: Selected by the effective interrupt output

polarity selection bit.

Effective only in three-phase mode 1

0: Normal mode

1: Three-phase PWM output mode

0: Output disabled

1: Output enabled

0: Feature disabled

1: Feature enabled

0: Not detected yet

1: Already detected

0: Triangular wave modulation mode

1: Sawtooth wave modulation mode

1: Trigger generated

The value, when read, is “0”.

(Note 1)

hree-phase PWM control register 1

Symbol

Address

When reset

INVC1

034916

0016

Bit name

Description

Bit symbol

INV10

INV11

INV12

Timer Ai start trigger

signal select bit

Timer A1-1, A2-1, A4-1

control bit

Short circuit timer count

source select bit

0: Timer B2 overflow signal

1: Timer B2 overflow signal,

signal for writing to timer B2

0: Three-phase mode 0

1: Three-phase mode 1

0 : Must not be set.

1 : f1/2 (Note)

b7 b6

b1 b0

Noting is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.

Noting is assigned.

In an attempt to write to this bit, write “0”. The value, if read, turns out to be “0”.

Reserved bit

Must always be set to “0”

Note : To use three-phase PWM output mode, write “1” to INV12.

Note 1:

Note 2:

Note 3:

Note 4:

No value other than “0” can be written.

Selecting three-phase PWM output mode causes P80, P81, and P72 through P75 to output U, U, V, V, W, and W, and works the

timer for setting short circuit prevention time, the U, V, W phase output control circuits, and the circuit for setting timer B2 interrupt

frequency.

In triangular wave modulation mode:

The short circuit prevention timer starts in synchronization with the falling edge of timer Ai output.

The data transfer from the three-phase buffer register to the three-phase output shift register is made only once in synchronization

with the transfer trigger signal after writing to the three-phase output buffer register.

In sawtooth wave modulation mode:

The short circuit prevention timer starts in synchronization with the falling edge of timer A output and with the transfer trigger signal.

The data transfer from the three-phase output buffer register to the three-phase output shift register is made with respect to every

transfer trigger.

To write “1” to bit 1 (INV01) of the three-phase PWM control register 0, set in advance the content of the timer B2 interrupt

occurrences frequency set counter.

Figure 1.15.1. Registers related to timers for three-phase motor control

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