MCF5272VF66 Freescale, MCF5272VF66 Datasheet - Page 268

• 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)
12.3.2.3
The value in the RFMR can be used to determine approximately how much time has elapsed since the USB
host sent its last start-of-frame packet.
Because the hardware does not guarantee that any of the bit values are stable during the read access:
Figure 12-5
Table 12-5
12-10
15–14
13–0
Bits
•
•
only the higher-order bits should be used
the returned data should always be de-glitched by verifying that the same value is seen on the
higher-order bits for two consecutive read cycles.
Name
RTFM
lists field descriptions for the USB real-time frame monitor register.
—
shows the USB real-time frame monitor register.
Reset
Field
USB Real-Time Frame Monitor Register (RFMR)
Addr
R/W
Reserved, should be cleared.
Real-time frame count. Contains the current USB frame counter value. The counter is incremented one
time for every USB bit time and is reset when a SOF packet from the host is detected or an artificial start
of frame (ASOF) interrupt is generated.
15
—
MCF5272 ColdFire
Figure 12-5. USB Real-Time Frame Monitor Register (RFMR)
14
13
Table 12-5. RFMR Field Descriptions
®
Integrated Microprocessor User’s Manual, Rev. 3
0000_0000_0000_0000
MBAR + 0x100A
Read
Description
RTFM
Freescale Semiconductor
0