Triangular Wave Modulation Three-Phase Mode 1 - Renesas M16C/64C User Manual

M16C/64C Group
19.3.3

Triangular Wave Modulation Three-Phase Mode 1

Triangular wave modulation uses twice the cycles of timer B2 as a reference cycle. Table 19.12 lists
Three-Phase Mode 1 Specifications, and Figure 19.7 shows Example of Three-Phase Mode 1
Operation.
Table 19.12 Three-Phase Mode 1 Specifications
Item
Carrier wave cycle
Three-phase PWM output width
Reference cycle
Timer B2 reload timing
Three-phase PWM
waveform control
Timer B2 interrupt
Detection of a carrier
wave cycle
(first half or last half)
i = 1, 2, 4
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
( ) 2 ×
m 1
+
---------------------------- -
fi
m: Setting value of the TB2 register, 0000h to FFFFh
fi: Count source frequency (f1TIMAB, f2TIMAB, f8TIMAB, f32TIMAB,
f64TIMAB, fOCO-S, fC32)
'
m + 1 n – + n
---------------------------------- -
fi
m+1
n n'
m+1-n+n'
n, n': Setting value of the TAi register, 0001h to FFFFh
fi: Count source frequency (f1TIMAB, f2TIMAB, f8TIMAB, f32TIMAB,
f64TIMAB, fOCO-S, fC32)
Twice the cycle of timer B2 (cycle of the carrier wave)
Select either of the following:
•
Timer B2 underflow
•
Timer A output at an odd number of times
Counts the values of registers TAi and TAi1 alternately every time a
timer Ai start trigger is generated
Select a count timing for the ICTB2 register by bits INV01 to INV00 in
the INVC0 register:
•
Timer B2 underflow (each time)
•
Timer B2 underflow when the INV13 bit in the INVC1 register is 0
•
Timer B2 underflow when the INV13 bit is 1
When the setting value in the ICTB2 register is n, a timer B2 interrupt
request is generated every nth time of the timing selected by setting bits
INV01 to INV00.
Detected
(The INV13 bit in the INVC1 register is enabled.)
19. Three-Phase Motor Control Timer Function
Specification
Page 354 of 807