Infineon TLE984 QX Series, User Manual

Page: 524 / 972

User Manual 524 Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Capture/Compare Unit 6 (CCU6)
Figure 131 Compare Waveform Examples
Example b) illustrates the transition to a duty cycle of 100%. First, a compare value of 0001
H
is used, then
changed to 0000
H
. Please note that a low pulse with the length of one T12 clock is still produced in the cycle
where the new value 0000
H
is in effect; this pulse originates from the previous value 0001
H
. In the following
timer cycles, the State Bit CC6xST remains at 1, producing a 100% duty cycle signal. In this case, the compare
rule ‘zero-match AND compare-match’ is in effect.
Example f) shows the transition to a duty cycle of 0%. The new compare value is set to <Period-Value> + 1, and
the State Bit CC6ST remains cleared.
Figure 132 illustrates an example for the waveforms of all three channels. With the appropriate dead-time
control and output modulation, a very efficient 3-phase PWM signal can be generated.
CCU6_MCT05517
f
T12
CDIR
CC6x
Value n Value n+1 Value n+2 Value n+3
T12 Count
Period
Value = 5
Zero
CC6x = 2
Down Down Up Up
CC6x = 2 CC6x = 1 CC6x = 1
a)
CC6x = 1
b)
CC6x = 0 CC6x = 0 CC6x = 0
CC6x = 3 CC6x = 3 CC6x = 3 CC6x = 3
c)
CC6x = 4 CC6x = 4 CC6x = 4 CC6x = 4
d)
CC6x = 5 CC6x = 5 CC6x = 5 CC6x = 5
e)
CC6x = 3 CC6x = 6 CC6x = 6 CC6x = 6
f)