MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 262

• Manufacturer Part Number: MCF5272VF66
• Manufacturer: Freescale

Specifications of MCF5272VF66

• Family Name: MCF5xxx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 66MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 3.3V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 196
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Not Compliant

Universal Serial Bus (USB)
However, to reduce power consumption, USB_VDD may be left unconnected if either of the following is
true:
12.2.1.2
The USB module requires two clock inputs; the system clock and a 48-MHz data clock. The data clock
source is selectable between the USB_ExtCLK pin or the system clock. The clock generator automatically
uses the external clock as the data clock if it detects the presence of a clock signal on the USB_CLK pin
during system reset. This automatic selection can be overridden by setting bit USBEPCTL0[CLK_SEL],
. If a clock signal is not present on USB_CLK, the clock generator uses the system clock.
12.2.1.3
The control logic performs the following functions:
12-4
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•
•
•
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The USB module is not used.
An external transceiver is used.
For transmitted data:
— Packet creation
— Parallel-to-serial conversion
— CRC generation
— NRZI encoding
— Bit stuffing
For received data:
— Sync detection
— Packet identification
— End-of-packet detection
— Serial-to-parallel conversion
— CRC validation
— NRZI decoding
— Bit unstuffing
For error detection:
— Bad CRC
— Timeout waiting for end-of-packet
— Bit stuffing violations
Clock Generator
USB Control Logic
In all cases, the system clock must be at least 24-MHz for the USB module
to function properly. If the system clock is used for the USB data clock, the
system clock frequency must be 48-MHz.
MCF5272 ColdFire
®
Integrated Microprocessor User’s Manual, Rev. 3
NOTE
Freescale Semiconductor