AN1857 Freescale Semiconductor / Motorola, AN1857 Datasheet - Page 41

• Manufacturer Part Number: AN1857
• Description: A 3-Phase ac Induction Motor Control System Based on the MC68HC908MR32
• Manufacturer: Freescale Semiconductor / Motorola

AN1857
MOTOROLA
crossing interrupt for the PFC, an output compare to generate the input
current waveform, an A/D interrupt to control PFC output voltage, SCI
read, and transmit routines.
Initialization — The main routine provides initialization of the
microcontroller:
An example of initialization of PLL clock and motor control PWM mod-
ules for the MR32 follows.
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Clears RAM
Initializes PLL clock
Initializes PWM module:
– Center-aligned complementary PWM mode, positive polarity
– COP and LVI enable (MOR register)
– PWM modulus — Defines the PWM frequency (PMOD
– 2- s dead-time (DEADTM register)
– PWM interrupt reload every fourth PWM cycle (PCTL2
– FAULT2 (overcurrent fault) in manual mode, interrupt enabled
Sets up I/O ports
Initializes timer A for input compare, output compare, and for a
software timer reference
Initializes timer B for PWM generation for the PFC
Initializes the A/D converter
Detects connected boards
Detects input line voltage limits
Detects input line frequency
Calibrates the PFC feedback offset FB_offset
If any error occurs, the fault LED is turned on, the failure register
is set, and the software waits for reset.
Enable interrupts
(MOR register)
register)
register)
(FCR register)
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Application Note
Software
41