M30222 Datasheet, PDF (92/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
Specifications in this manual are tentative and subject to change
M30222 Group
Rev. G
Timer Functions for Three-phase Motor Control
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer 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 1.69 to 1.71 show registers related to timers for three-phase motor control.
Three-phase PWM control register 0
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
INVC0
Address
034816
When reset
0016
Bit symbol
Bit name
Description
RW
INV00
Effective interrupt output
polarity select bit
(Note 4)
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
INV01
Effective interrupt output
specification bit
(Note4)
0: Not specified.
1: Selected by the effective interrupt output
polarity selection bit.
Effective only in three-phase mode 1
INV02
Mode select bit
(Note 2)
0: Normal mode
1: Three-phase PWM output mode
INV03
Output control bit
0: Output disabled
1: Output enabled
INV04
Positive and negative
phases concurrent L
output disable function
enable bit
0: Feature disabled
1: Feature enabled
INV05
INV06
Positive and negative
phases concurrent L
output detect flag
Modulation mode select
bit (Note 3)
0: Not detected yet
1: Already detected
0: Triangular wave modulation mode
1: Sawtooth wave modulation mode
(Note 1)
INV07
Software trigger bit
1: Trigger generated
The value, when read, is “0”.
Note 1: No value other than “0” can be written.
Note 2: Selecting three-phase PWM output mode causes P8 0, 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.
Note 3: 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.
Note 4: To write “1” both to bit 0 (INV00) and bit 1 (INV01) of the three-phase PWM control register, set in advance the content of the Timer
B2 interrupt occurrences frequency set counter.
Three-phase PWM control register 1
b7 b6 b5 b4 b3 b2 b1 b0
0
Symbol
INVC1
Address
034916
When reset
0016
Bit symbol
Bit name
INV10
Timer Ai start trigger
signal select bit
Description
0: Timer B2 overflow signal
1: Timer B2 overflow signal,
signal for writing to timer B2
INV11
Timer A1-1, A2-1, A4-1
control bit
0: Three-phase mode 0
1: Three-phase mode 1
INV12
Short circuit timer count 0 : Not to be used
source select bit
1 : f1/2
Nothing is assigned.
Write "0" when writing to this bit. If read, the value is "0".
Reserved bit
Always set to “0”
Nothing is assigned.
Write "0" when writing to these bits. If read, the value is "0".
Note 1: To use three-phase PWM output mode, write “1” to INV12.
Fig. 1.69. Registers related to timers for three-phase motor control
RW
1-93