Variable bit width bit operation control systems and methods

Abstract

The invention relates to variable bit width bit operation control systems and methods. The variable bit width bit operation control system is characterized by comprising a first control register, a second control register, a third control register, a bit read-write control circuit, an OR operation circuit and an AND operation circuit, wherein the first control register is a bit operation write 1 control register; the second control register is a bit operation write 0 control register; the third control register is a bit operation read control register. The OR operation circuit is used for performing OR operation on the numerical value of the operated bit and the numerical value of the first control register and feeding back a result to the bit read-write control circuit; and the AND operation circuit is used for carrying out AND operation on the numerical value of the operated bit and the numerical value of the second control register and feeding back a result to the bit read-write control circuit, and the bit read-write control circuit is used for realizing read-write control.

Description

technical field [0001] The invention relates to the field of embedded system interfaces, and more specifically relates to a variable bit width bit operation control system and method. Background technique [0002] There are a large number of external devices in the embedded system, but the structure is relatively simple. For these devices, some need the CPU to provide control means, and some need to provide input signals for the CPU, and many of these devices only need one bit, that is, As long as there are two states of on and off, for example: the light is on and off. It is not suitable to use traditional serial port or parallel port to control the circuits of these devices, so the chip usually provides general purpose programmable input / output (General Purpose Input Output, GPIO for short) interface. [0003] The GPIO interface is relative to the chip itself, and is generally used as the GPIO pin of the chip. GPIO pins can be directly controlled by software, using progr...

AI Technical Summary

Problems solved by technology

If there are multiple bits that need to be controlled by bit operations, multiple corresponding independent registers and address units are required, which wastes space and increases the cost of the number of registers

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