LM3S3748 Datasheet, PDF (583/753 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S3748 Microcontroller
Bit/Field
2
1:0
Name
EPENDE
EPEN
Type
R/W
R/W
Reset
0
0x00
Description
EPEN Drive Enable
Specifies whether the USB0EPEN signal is driven or undriven (tristate).
When driven, the signal value is specified by the EPEN bit. When not
driven, the EPEN bit is ignored and the USB0EPEN signal is placed in a
high-impedance state.
Value Description
0 Not Driven
The USB0EPEN signal is high impedance.
1 Driven
The USB0EPEN signal is driven to the logical value specified by
the EPEN bit value.
The USB0EPEN is undriven at reset since the sense of the external power
supply enable is unknown. By adding high-impedance state, system
designers may bias the power supply enable to the disabled state using
a large resistor (100 kΩ) and later configure and drive the output signal
to enable the power supply.
External Power Supply Enable Configuration
Specifies and controls the logical value driven on the USB0EPEN signal.
Value Description
0x0 Power Enable Active Low
The USB0EPEN signal is driven Low if EPENDE is 1.
0x1 Power Enable Active High
The USB0EPEN signal is driven High if EPENDE is 1.
0x2-0x3 Reserved
April 08, 2008
583
Preliminary