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Pull-up resistors may be discrete devices mounted on the same circuit board as the logic devices. Many microcontrollers intended for embedded control applications have internal, programmable pull-up resistors for logic inputs so that not many external components are needed.
Modern microcontrollers may allow programming particular output pins to use open drain instead of push–pull output, the strength of the internal pull-up, and allow disabling internal pullups when not desired. [3] For pMOS open drain, the output instead connects to the positive power rail when the transistor is on, and is hi-Z when off.
LPC111xL consists of LPC111x features, plus low power profile in active and sleep modes, internal pull-up resistors to pull-up pins to full VDD level, programmable pseudo open-drain mode for GPIO pins, upgraded to windowed watch dog timer with clock source lock capability.
Pull-up resistors are provided by the I3C controller. External pull-up resistors are no longer needed. Clock Stretching – devices are expected to be fast enough to operate at bus speed. The I3C controller is the sole clock source. I²C Extended (10-bit) Addresses. All devices on an I3C bus are addressed by a 7-bit address.
On very low-power systems, the pull-up resistors can use more power than the entire rest of the design combined. On these, the resistors are often powered by a switchable voltage source, such as a DIO from a microcontroller. The pull-ups also limit the speed of the bus and have a small additional cost.
Circuit designers will often use pull-up or pull-down resistors (usually within the range of 1–100 kΩ) to influence the circuit when the output is tri-stated. The PCI local bus provides pull-up resistors, but they would require several clock cycles to pull a signal high given the bus's large distributed capacitance .
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Multifunction, bi-directional general-purpose I/O ports with configurable, built-in pull-up resistors; Multiple internal oscillators, including RC oscillator without external parts; Internal, self-programmable instruction flash memory up to 256 KB (384 KB on XMega) In-system programmable using serial/parallel low-voltage proprietary interfaces ...
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