MC56F8257MLH Freescale Semiconductor, MC56F8257MLH Datasheet - Page 281

• 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

distortion one of two different factors must be added to the desired PWM value,
depending on whether the top or bottom transistor is controlling the output voltage.
Therefore, the software is responsible for calculating both compensated PWM values
prior to placing them in the VALx registers. Either the VAL2/VAL3 or the VAL4/VAL5
register pair controls the pulse width at any given time. For a given PWM pair, whether
the VAL2/VAL3 or VAL4/VAL5 pair is active depends on either:
To correct deadtime distortion, software can decrease or increase the value in the
appropriate VALx register.
7.4.2.8.2 Manual Correction
To detect the current status, the voltage on each PWMX pin is sampled twice in a PWM
period, at the end of each deadtime. The value is stored in CTRL[DT]. CTRL[DT] is a
timing marker especially indicating when to toggle between PWM value registers.
Software can then set MCTRL[IPOL] to switch between VAL2/VAL3 and VAL4/VAL5
register pairs according to CTRL[DT] values.
Freescale Semiconductor
• The state of the current status pin, PWMX, for that driver
• The state of the odd/even correction bit, MCTRL[IPOL], for that driver
• In edge-aligned operation, decreasing or increasing the PWM value by a correction
• In center-aligned operation, decreasing or increasing the PWM value by a correction
value equal to the deadtime typically compensates for deadtime distortion.
value equal to one-half the deadtime typically compensates for deadtime distortion.
Figure 7-228. Current-status Sense Scheme for Deadtime Correction
MC56F825x/4x Reference Manual, Rev. 2, 10/2010
Preliminary
Chapter 7 Enhanced Flex Pulse Width Modulator (eFlexPWM)
281