M16C62_M Datasheet, PDF (115/615 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Timers’ functions for three-phase motor control
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
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
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 0: A timer B2 interrupt occurs when the timer
polarity select bit
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
INV02
Effective interrupt output 0: Not specified.
specification bit
1: Selected by the effective interrupt output
(Note 4)
polarity selection bit.
Effective only in three-phase mode 1
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
INV05
INV06
Positive and negative
phases concurrent L
output disable function
enable bit
0: Feature disabled
1: Feature enabled
Positive and negative
phases concurrent L
output detect flag
0: Not detected yet
1: Already detected
Modulation mode select 0: Triangular wave modulation mode
bit (Note 3)
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 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.
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” 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.
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
Description
INV10
Timer Ai start trigger
signal select bit
0: Timer B2 overflow signal
1: Timer B2 overflow signal,
signal for writing to timer B2
INV11
Timer A1-1, A2-1, A4-1 0: Three-phase mode 0
control bit
1: Three-phase mode 1
INV12
Short circuit timer count 0 : Must not be set.
source select bit
1 : f1/2 (Note)
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”
Noting is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.
Note : To use three-phase PWM output mode, write “1” to INV12.
Figure 1.15.1. Registers related to timers for three-phase motor control
RW
1-96