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MPC8280 Datasheet(PDF) 819 Page - Freescale Semiconductor, Inc

No. de pieza MPC8280
Descripción Electrónicos  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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Fabricante Electrónico  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 819 Page - Freescale Semiconductor, Inc

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Universal Serial Bus Controller
MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
Freescale Semiconductor
27-3
Figure 27-1. USB Interface
The reference clock for the USB controller (USBCLK) is used by the DPLL circuitry to recover the bit
rate clock. The source for USBCLK is selected in CMXSCR[TS4CS] (refer to Section 16.4.3, “CMX SI2
Clock Route Register (CMXSI2CR)”). The MPC8280 can run at different frequencies, but the USB
reference clock must be four times the USB bit rate. Thus, USBCLK must be 48 MHz for a 12-Mbps
full-speed transfer or 6 MHz for a 1.5-Mbps low-speed transfer.
There are six I/O pins associated with the USB port. Their functionality is described in Table 27-1.
Additional control lines that might be needed by some transceivers (e.g., speed select, low power control)
may be supported by general purpose output lines.
Table 27-1. USB Pins Functions
Signal
I/O
Function
USBTXN,
USBTXP
O
Outputs from the USB transmitter, inputs to the differential driver
.
USBOE
O
Output enable. Enables the transceiver to send data on the bus.
USBTXP
USBRXD
D+
D–
USBOE
USBTXN
USBRXP
USBRXN
MPC8280
+
–
USB
transceiver
TP
TN
Result
0
0
Single ended “0”
0
1
Logic “0”
1
0
Logic “1”
11
—



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