Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 11 MOTOR CONTROL FUNCTION
R01UH0042EJ0500 Rev.5.00 Page 596 of 1513
Aug 12, 2011
11.4.2 Dead-time control (generation of negative-phase wave signal)
(1) Dead-time control mechanism
In the 6-phase PWM output mode, compare registers 1 to 3 (TAB1CCR1, TAB1CCR2, and TAB1CCR3) are used to
set the duty factor, and compare register 0 (TAB1CCR0) is used to set the cycle. By setting these four registers
and by starting the operation of TAB1, three types of PWM output waves (basic 3-phase waves) with a variable duty
factor are generated. These three PWM output waves are input to the timer Q option unit (TMQOP) and their
inverted signal with dead-time is created to generate three sets of (six) PWM waves.
The TMQOP unit consists of three 10-bit counters (dead-time counters 1 to 3) that operate in synchronization with
the count clock of TAB1, and a TAB1 dead-time compare register (TAB1DTC) that specifies dead time. If “a” is set
to the TAB1DTC register, the dead-time value is “a”, and interval “a” is created between a positive-phase wave and
a negative-phase wave.
Figure 11-8. PWM Output Wave with Dead Time (1)
(a) When dead time is inserted (TAB1DTC register = a)
a a
16-bit
counter
TOAB1m signal
(internal signal)
Dead-time
counter m
TOAB1Tm
pin output
TOAB1Bm
pin output
(b) No dead time (TAB1DTC register = 000H)
0 0
0000H
16-bit
counter
TOAB1m signal
(internal signal)
Dead-time
counter m
TOAB1Tm
pin output
TOAB1Bm
pin output
Remark m = 1 to 3