mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 943

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

When initially enabled by setting the PWMEN bit, no current status has previously been sampled. PWM
value registers one, three, and five initially control the three PWM pairs when configured for current status
correction.
Freescale Semiconductor
PMFCNT = PMFMOD
Values latched on the ISx pins are buffered so only one PWM register is
used per PWM cycle. If a current status changes during a PWM period, the
new value does not take effect until the next PWM period.
IN DEADTIME
DESIRED LOAD VOLTAGE
ISx PIN
PWM CYCLE START
ISx PIN
PWM CYCLE START
INITIAL VALUE = 0
Figure 20-57. Internal Correction Logic when ISENS = 10
Figure 20-58. Internal Correction Logic when ISENS = 11
EVEN PWMVAL REGISTER
ODD PWMVAL REGISTER
INITIAL VALUE = 0
LOAD VOLTAGE
BOTTOM PWM
PWM CONTROLLED BY
PWM CONTROLLED BY
D
Figure 20-59. Correction with Positive Current
EVEN PWMVAL REGISTER
CLK
ODD PWMVAL REGISTER
MC9S12XF - Family Reference Manual, Rev.1.19
TOP PWM
PWM CONTROLLED BY
PWM CONTROLLED BY
D
CLK
Q
Q
D
CLK
Chapter 20 Pulse Width Modulator with Fault Protection (PMF15B6C) Module
D
CLK
Q
NOTE
A
B
Q
A/B
A
B
A/B
GENERATOR
DEADTIME
GENERATOR
DEADTIME
TOP PWM
BOTTOM PWM
TOP PWM
BOTTOM PWM
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