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The B&R controller is the component that directs the various parts of a computer to work in coordination according to the functional requirements of instructions. It is the neural center and command hub of the computer, composed of three components: the instruction register IR, the program counter PC, and the operation controller 0C. It is extremely important for coordinating the orderly operation of the entire computer. Each functional component within the CPU performs a specific function. The implementation of control components manages the transmission of information between components and the flow of data. The paths that transmit information between many digital components are commonly referred to as "data paths." Where information starts, which register or multiplexer it passes through in the middle, and which register it finally reaches must all be controlled.

B&R controller introduction

A program consists of several program segments. The instructions of each segment can be designed to be stored sequentially in memory. Therefore, as long as the instruction address register also has counting functionality, it can count during instruction execution, automatically increment by one, and thereby form the address of the next instruction, achieving sequential instruction execution. This method is suitable for computers using random-access memory as main memory. When program execution needs to switch from one program segment to another, a branch instruction can be used. The branch instruction contains the address of the entry instruction of the target program segment. When executing the branch instruction, this address is loaded into the program counter (which acts only as an instruction address register at this time, not counting) as the address of the next instruction, thereby achieving the purpose of branching to a program segment. Subroutine calls, interrupt handling, and trap handling use similar methods. After the widespread adoption of random-access memory, the overall operational effectiveness of the second method was significantly superior to the first. Consequently, sequential instruction execution has become the standard method adopted by mainstream computers, and the program counter has become an indispensable control component of the central processing unit.

B&R controller composition

1) Control memory (Control Memory) is used to store the microprograms corresponding to each machine instruction. The decoder is used to generate the entry address for the microprogram corresponding to a machine instruction. When the microinstructions of the microprogram corresponding to a machine instruction are fetched one by one and sent to the microinstruction register, the micro-operation commands are issued according to the pre-designed logic, thereby completing the function of that machine instruction. This applies to every machine instruction. 2) The width of the microinstruction directly determines the width of the microprogram controller. To simplify the control memory, measures can be taken to shorten the width of the microinstruction, such as adopting field decoding with single-stage segmented decoding. Obviously, the control field of the microinstruction will be greatly shortened. Some micro-operation commands that need to be generated simultaneously cannot be arranged in the same field. To further shorten the control field, field decoding can be designed as two-stage or multi-stage.

B&R controller applications

For some electronic devices, automatic alarm settings are included. Alarm control is also a frequently used area of microcontroller technology, mainly reflected in the following aspects: First, for some automatic alarm devices, such as fire alarms commonly used in homes, these are devices that activate intelligent alarms when external environmental conditions reach certain levels. If the smoke concentration indoors reaches a certain level, or if collected external data reaches a certain state, the alarm setting is automatically triggered, thereby realizing the function of intelligent alarming. Second, for some intelligent electronic devices, if the external environment exceeds the device's operating range, or if there are abnormalities with the device, its own alarm mechanism is triggered. This allows users to promptly understand the operational status of the device and provides solutions based on the alarm information. For example, in some factories, devices are often installed to monitor the production environment. When certain abnormal data occurs, an alarm is triggered. To ensure normal device operation, maintenance personnel must handle the issue promptly to avoid major failures.

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