MC9S12E128CPV Freescale Semiconductor, MC9S12E128CPV Datasheet - Page 358

• Manufacturer Part Number: MC9S12E128CPV
• Description: Microcontrollers (MCU) 16 Bit 16MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC9S12E128CPV

• Data Bus Width: 16 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 8 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 92
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.135 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP-112
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• On-chip Dac: 8 bit, 2 Channel
• Lead Free Status / Rohs Status: No RoHS Version Available

Chapter 11 Pulse Width Modulator with Fault Protection (PMF15B6CV2)
11.4.3.2
A PWM period is determined by the value written to the PWM counter modulo register.
The PWM counter is an up/down counter in a center-aligned operation. In this mode the PWM highest
output resolution is two bus clock cycles.
358
PWM period = (PWM modulus) (PWM clock period) 2
Period
PWM PERIOD = 8 x PWM CLOCK PERIOD
Because of the equals-comparator architecture of this PMF, the modulus
equals zero case is considered illegal. Therefore, the modulus register does
not return to zero, and a modulus value of zero will result in waveforms
inconsistent with the other modulus waveforms. If a modulus of zero is
loaded, the counter will continually count down from $7FFF. This operation
will not be tested or guaranteed. Consider it illegal. However, the dead-time
constraints and fault conditions will still be guaranteed.
ALIGNMENT REFERENCE
DUTY CYCLE = 50%
PWM OUTPUT
MODULUS = 4
UP COUNTER
PWM CLOCK PERIOD
UP/DOWN COUNTER
Figure 11-43. Center-Aligned PWM Period
Figure 11-42. Edge-Aligned PWM Output
MODULUS = 4
MC9S12E128 Data Sheet, Rev. 1.07
COUNT
NOTE
1
2
3
4
3
2
1
0
Freescale Semiconductor