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CS5535 Datasheet(PDF) 152 Page - National Semiconductor (TI) |
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CS5535 Datasheet(HTML) 152 Page - National Semiconductor (TI) |
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152 / 555 page  www.national.com 152 Revision 0.8 GPIO Subsystem Functional Description (Continued) 4.15.5.6 Auto Sense Two GPIOs (GPIO5 and GPIO6) have a function called “Auto-sense”. Auto-sense is a method of automatically determining whether or not to apply a pull-up or pull-down to the corresponding GPIO input. Auto-sensed inputs behave as follows: when reset is applied to the system, a weak pull-up is applied to the pad. When reset is de-asserted, the sensed value is used to establish the pull-up/down state on the de-assertion edge. If nothing pulls down the pad, then the pull-up continues to be applied. If the pad is pulled down, then the pull-up is cleared to 0 and the pull-down is set to 1. If a pull-down is desired, a diode between the reset signal and the GPIO pin will pull it down during the Auto-Sense operation but have no effect during normal operation. |
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