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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.
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 ...
The MSP430G2xx Value Series features flash-based Ultra-Low Power MCUs up to 16 MIPS with 1.8–3.6 V operation. It includes the Very-Low power Oscillator (VLO), internal pull-up/pull-down resistors, and low-pin count options at lower prices than the MSP430F2xx series. Ultra-Low Power, as low as (@2.2 V): 0.1 μA RAM retention
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.
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 .
Various resistor types of different shapes and sizes. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
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.
The high-impedance state of a given node in a circuit cannot be verified by a voltage measurement alone. A pull-up resistor (or pull-down resistor) can be used as a medium-impedance source to try to pull the wire to a high (or low) voltage level. If the node is not in a high-impedance state, extra current from the resistor will not ...