MC9S12E256MFUE Freescale Semiconductor, MC9S12E256MFUE Datasheet - Page 355

• Manufacturer Part Number: MC9S12E256MFUE
• Description: IC MCU 256K FLASH 25MHZ 80-QFP
• Manufacturer: Freescale Semiconductor
• Series: HCS12r

Specifications of MC9S12E256MFUE

• 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: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K 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 ~ 125°C
• Package / Case: 80-QFP
• Processor Series: S12E
• Core: HCS12
• Data Bus Width: 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C/SCI/SPI
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 60
• Number Of Timers: 12
• Operating Supply Voltage: 0 V to 5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWHCS12
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16-ch x 10-bit
• On-chip Dac: 2-ch x 8-bit
• Controller Family/series: HCS12/S12X
• No. Of I/o's: 60
• Ram Memory Size: 16KB
• Cpu Speed: 25MHz
• No. Of Timers: 3
• Embedded Interface Type: I2C, SCI, SPI
• Rohs Compliant: Yes
• For Use With: M68EVB912E128 - BOARD EVAL FOR MC9S12E128/64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

In an edge-aligned operation, the PWM counter is an up counter. The PWM output resolution is one bus
clock cycle.
11.4.3.3
The signed 16-bit number written to the PMF value registers is the pulse width in PWM clock periods of
the PWM generator output.
Freescale Semiconductor
PWM period = PWM modulus
Duty Cycle
A PWM value less than or equal to zero deactivates the PWM output for the
entire PWM period. A PWM value greater than or equal to the modulus
activates the PWM output for the entire PWM period.
PWM PERIOD = 4 x PWM CLOCK PERIOD
$8000–$FFFF
$0000–$7FFF
Table 11-46. PWM Value and Underflow Conditions
PMFVALx
Figure 11-44. Edge-Aligned PWM Period
PWM CLOCK PERIOD
MC9S12E256 Data Sheet, Rev. 1.08
Duty cycle
MODULUS = 4
UP COUNTER
PWM clock period
COUNT
Condition
Underflow
Normal
=
Chapter 11 Pulse Width Modulator with Fault Protection (PMF15B6CV2)
NOTE
------------------------------- -
MODULUS
PMFVAL
1
2
PWM Value Used
Value in registers
3
100
4
$0000
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