MC9S12E64CFU Freescale Semiconductor, MC9S12E64CFU Datasheet - Page 358

• Manufacturer Part Number: MC9S12E64CFU
• Description: IC MCU 64K FLASH 25MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12E64CFU

• Core Processor: HCS12
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, I²C, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 60
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.35 V ~ 2.75 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Data Bus Width: 16 bit
• Data Ram Size: 4 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 60
• Number Of Timers: 16 bit
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• On-chip Dac: 8 bit, 2 Channel
• For Use With: M68EVB912E128 - BOARD EVAL FOR MC9S12E128/64
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• 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
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