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Low Pin Count interface Winbond chip Trusted Platform Module installed on a motherboard, and using the LPC bus. The Low Pin Count (LPC) bus is a computer bus used on IBM-compatible personal computers to connect low-bandwidth devices to the CPU, such as the BIOS ROM (BIOS ROM was moved to the Serial Peripheral Interface (SPI) bus in 2006 [1]), "legacy" I/O devices (integrated into Super I/O ...
For example, in the x86 architecture, asserting the RESET line halts the CPU; this is done after the system is switched on and before the power supply has asserted "power good" to indicate that it is ready to supply stable voltages at sufficient power levels. [2] Reset places less stress on the hardware than power cycling, as the power is not ...
For the schematic on the right, a Reset input signal connects to the RESET pin and connecting a Set input signal to the TR pin. Thus, pulling Set momentarily low acts as a "set" and transitions the output to the high state (V CC). Conversely, pulling Reset momentarily low acts as a "reset" and transitions the Out pin to the low state (GND).
This normally takes between 0.1 and 0.5 seconds after the power supply is switched on. The signal is then sent to the motherboard, where it is received by the processor timer chip that controls the reset line to the processor.
A flow diagram of a computer booting In computing , booting is the process of starting a computer as initiated via hardware such as a physical button on the computer or by a software command. After it is switched on, a computer's central processing unit (CPU) has no software in its main memory , so some process must load software into memory ...
External pullups may be 'stronger' (lower resistance, perhaps 3 kΩ) to reduce signal rise times (like with I²C) or to minimize noise (like on system RESET inputs). 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 ...
The diagram below shows a conventional floppy disk controller which communicates with the CPU via an Industry Standard Architecture (ISA) bus or similar bus and communicates with the floppy disk drive with a 34 pin ribbon cable.
Red jumper on a pin header. When a jumper is placed over two or more jumper pins, an electrical connection is made between them, and the equipment is thus instructed to activate certain settings accordingly. For example, with older PC systems, CPU speed and voltage settings were often made by setting jumpers.