Why Cortex-M is the first choice for low power applications

While the Cortex-M processor family targets the lower end of the performance spectrum, Cortex-M is still quite powerful compared to other typical processors used in most microcontrollers (MCUs). For example, the Cortex-M4 and Cortex-M7 processors used in many high-performance microcontrollers have a maximum clock frequency of up to 400MHz.

Of course, performance is not the only factor in choosing a processor. In many applications, low power consumption and cost are the most important criteria for customers. Therefore, the Cortex-M processor family incorporates various types of products to meet different needs (Table 1).

The difference between Cortex-M and traditional ARM processors (like ARM7TDMI, ARM9) is the greatly modified architecture. for example:

· Interrupt processing task, the built-in controller (NVIC) called by nested vector interrupt controller executes, the NVIC provides automatic priority scheduling, interrupt masks and nested configuration, and a system exception.

The interrupt handler (Handler) can be written into a regular C language function and a vectorized interrupt processing mechanism, without using software to determine which interrupt of the service. Interrupted responses are decisive and have low latency characteristics.

In terms of the interrupt vector table, the branch instruction is changed to the start address of the interrupt and the system exception handler.

Some details of the scratchpad block and the program development mode have also changed.

These changes mean that many of the combined language code written for traditional ARM processors must be modified, and the old Projects files must be modified and recompiled when ported to Cortex-M.

Instruction set overview

In most cases, the software's code is written in C or other high-level languages. However, a basic understanding of the instruction set supported by the Cortex-M processor can help determine which Cortex-M processor is required for a particular task. The Instruction Set Architecture (ISA) is part of the processor architecture and the Cortex-M processor can be divided into several architecture types (Table 2).

All Cortex-M processors support an instruction set called Thumb. After the release of Thumb-2 technology, the entire Thumb instruction set became quite large. However, different Cortex-M processors support the sub-sets of instructions in the Thumb ISA, as shown in Figure 1.

Figure 1 Instruction set supported by various Cortex-M processors

The Cortex-M0/M0+/M1 processor is based on the ARMv6-M architecture and has a very small instruction set with only 56 instructions, most of which are 16 bits, as shown in Figure 1 for the smaller ellipse. However, the scratchpad in the processor and the processed data are still 32 bits. For most simple I/O control jobs and for generating data processing, such a small instruction set is sufficient. Since the instruction set is small, only a small number of logic gates are required to build the processor. For example, the Cortex-M0 and Cortex-M0+ processors require only 12,000 logic gates. However, some of these instructions cannot be used with high-order registers (R8 to R12), and their ability to generate data on the fly is quite limited. This is primarily to make a compromise between ultra low power processor design and performance.

The Cortex-M3 processor is based on the ARMv7-M architecture and supports a large number of instruction sets, many of which are 32-bit instructions, allowing the system to use the high-order registers more efficiently. In addition, it supports vector table branch instructions and conditional execution (using IT instructions), hardware divide instructions, multiply-accumulate (MAC) operations, and variable bit field operations.

PCD Turning Tools

pcd turning tools are high hardness, strong thermal conductivity and good wear resistance of diamond can obtain highmachining precision and machining efficiency in high speed cutting.

The high hardness of diamond is combined with the toughness of steel or alloy, and the performanceof PCD/PCBN tool is greatly improved with special treatment.

The advantages of PCD/CBN super hard cutting tool have excellent effect on turning ream and milling.

FEATURE:

Features
1. The PCD or PCBN turning tool can cut the material from different direction.
2. The PCD or PCBN turning tool can realize fast speed turning, hard material turning, and dry turning.
3. According to the need of our customers, we can design and manufacture the diamond turning tool with different specifications, by changing the sizes of the cutter arbor, rake angle, clearance angle, tool cutting edge angle, tool minor cutting edge angle, nose angle, cutting edge form and the width of the chamfering.

Flexible in order quantity:

Samples can be provided before mass production, and MOQ can be discussed accordingly.

PRODUCT DETAIL:

PRODUCTING PROGRESS:

PAYMENT AND DELIVERY:

PRODUCT EQUIPMENT :

ABOUT US :

We are specialize in manufacturing PCD diamond tools and Carbide tools. Our major product inclulde PCD Inserts , PCD Reamers , PCD End Mills, PCD Taps, Cabide Inserts,Carbide Drills, Carbide Reams, Taps etc.,

We also offered customized cutting tools per drawings, and provide package according to customer requirements. We manufacture a series range of cutting tools for machining of Cast iron, Aluminium alloy and Non-Ferros metal, it is widely used in all major sectors like Automobiles, Engineering, Aerospace, Aviation and 3C industry. Premium quality of raw material is used in the production and strict examination during processing with advanced equipment, so our client are satisfied with our reliable quality and on-time delivery.

Our best selling of cutting tools include PCD Inserts, PCD End Mill, PCD Ball Nose Mill, PCD Reamer, Carbide Taps, Carbide End Mill, Special Form Cutter and many more. For these years we have been made a large forward in the technologies of manufacturing cutting tools. With high quality on performance and price, our product sells well both on domestic and overseas market. And we will always focus on the quality and best service, to make long business relationship.

quanlity control:

We have dedicated team of quality control and precise equipment to keep good and stable performance for our products and processing services.

PCD Turning Tools,Turning Tool,Lathe Cutting Tools,Metal Lathe Cutting Tools

OPT Cutting Tools Co., Ltd. , https://www.optdiamondtoolss.com