MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 1777

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Each channel has a dedicated internal 16-bit counter that increments once for each divided
clock period presented from the clock divider.
These two values define the starting and ending points for the logically "active" portion of
the waveform. As shown in
example, active or inactive, is completely controlled by the active and inactive state values
in the channel control registers.
The actual values obtainable on the output are shown in
state is to turn off the output driver to provide a high-Z output. This is useful for external
circuits that drive E.L. backlights and for direct drive of LEDs.
Freescale Semiconductor, Inc.
• The internal counter resets when it reaches the value stored in the channel control
• The Active flip-flop is set to 1 when the internal counter reaches the value stored in
• It remains high until the internal counter exceeds the value stored in
registers, for example, HW_PWM_PERIOD0_PERIOD.
HW_PWM_ACTIVE0_ACTIVE.
HW_PWM_ACTIVE0_INACTIVE.
PWM0 Output
ACTIVE_FF
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
inactive_state[1:0]
Figure 28-2. PWM Output Example
Figure
ACTIVE
HW_PWM_PERIOD0_INACTIVE_STATE
HW_PWM_ACTIVE0_ACTIVE
28-2, the actual state on the output for each phase, for
INACTIVE
active_state[1:0]
HW_PWM_ACTIVE0_INACTIVE
PERIOD
HW_PWM_PERIOD0_PERIOD
HW_PWM_PERIOD0_ACTIVE_STATE
Chapter 28 Pulse-Width Modulator (PWM) Controller
inactive_state[1:0]
Figure
28-2. Notice that one possible
active_state[1:0]
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