MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 269

• Manufacturer Part Number: MC56F8257MLH
• Description: DSC 64K FLASH 60MHZ 64-LQFP
• Manufacturer: Freescale Semiconductor
• Series: 56F8xxxr

Specifications of MC56F8257MLH

• Core Processor: 56800E
• Core Size: 16-Bit
• Speed: 60MHz
• Connectivity: CAN, I²C, LIN, SCI, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Ram Size: 4K x 16
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x12b, D/A 1x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 64-LQFP
• Product: DSCs
• Processor Series: 56800E
• Core: 56800E
• Device Million Instructions Per Second: 60 MIPs
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 54
• Data Ram Size: 8 KB
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

switched simultaneously. The signal switching is performed upstream from the deadtime
generator so that any abrupt changes that might occur do not violate deadtime on the
power stage when in complementary mode.
Figure 7-217
brushless DC motor it is desirable on many cases to spin the motor without need of hall-
effect sensor feedback. Instead, the back EMF of the motor phases is monitored and this
information is used to schedule the next commutation event. The top waveforms of
Figure 7-217
events (represented by the long vertical lines in the diagram) are scheduled based on the
zero crossings of the back-EMF waveforms. The PWM module is configured via
software ahead of time with the next state of the PWM pins in anticipation of the
compare event. When it happens, the output compare of the timer drives the
FORCE_OUT signal which immediately changes the state of the PWM pins to the next
commutation state with no software latency.
Freescale Semiconductor
shows a popular application that can benefit from this feature. On a
are a simplistic representation of these back EMF signals. Timer compare
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
Preliminary
Chapter 7 Enhanced Flex Pulse Width Modulator (eFlexPWM)
269