M32C8A Datasheet, PDF (210/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
16. Three-Phase Motor Control Timer Function
16.2 Sawtooth Wave Modulation Mode
In sawtooth wave modulation mode, one cycle of carrier waveform consists of one timer B2 underflow cycle.
A timer Ai one-shot pulse (i = 1, 2, and 4) is generated by using a timer B2 underflow signal as a trigger. One timer
Ai one-shot pulse is used to output one cycle of the PWM waveform. Table 16.4 lists specifications and settings of
sawtooth wave modulation mode.
Table 16.4 Specifications and Settings of Sawtooth Wave Modulation Mode
Item
INV06 bit
INV11 bit
Bits INV01 and INV00
PWCON bit
ICTB2 register
INV16 bit
Carrier wave cycle
Upper arm active level output
width
Timer B2 interrupt generation
timing
Timer B2 reload timing
Transfer timing from IDBp
register to three-phase output
shift register (p = 0, 1)
Dead time timer start timing
Three-Phase Mode 0
1
0
00b or 01b
0
n
0
1 _{× (m + 1)}
f1
1
f1
× a_k
Every n-th timer B2 underflow
Timer B2 underflow
Every time a transfer trigger occurs.
At the falling edge of the one-shot pulse of timer A1, A2 and A4
m: Value of the TB2 register
a_k: Value set to the TAi register at k-th time.
Rev.1.00 Jul 15, 2007 Page 193 of 352
REJ09B0385-0100