SAF-XC878CM-16FFI 5V AA

Introduction

SAF-XC878CM-16FFI 5V AA is a highly integrated chip that integrates most of the functions of a single chip microcontroller. It has high performance and low power consumption. It is mainly used in automotive electronics, domestic electronic appliances, office automation equipment and various types of industrial control systems. It adopts the 5VAA package, which has the advantages of small size, less pins, reliable operation, and high integration. The product has a special power-down impact suppressing port that is one of the advantages, so in a variety of electronic products which require low power consumption, it is one of the choices.

Application Field

SAF-XC878CM-16FFI 5V AA is mainly used in automotive electronics, domestic electronic appliances, office automation equipment, communication systems and other microcontroller systems. In the automotive electronics, it is mainly used in power system control and other functions, such as engine control, airbag control, antispark control and throttle control. In the domestic electronic appliances field, it is mainly used in the control of air conditioners, refrigerators, televisions and other products. In the field of office automation, it is mainly used in the control of printers, copiers, and fax machines; in the communication system, it is mainly used in the embedded control of modems and routers. In addition, it is also used in various types of embedded control systems.

Working Principle

SAF-XC878CM-16FFI 5V AA mainly adopts 16-bit MCS51 core CPU, and supports 8K/12K/16K of flash memory code. It has functions such as LCD driver, watchdog, communication interface, timer/counter, A/D, pulse width modulation, capture and external interrupt and other functions. It has 8-bit 8051 instruction set, 20-bit address space and 8-bit data bus. It has 2-stage 8-bit and 4-stage 16-bit pipelined instruction processing. The maximum frequency of 16K flash memory is 20MHz. It has high speed, low power consumption and reliable operation. The working principle is mainly divided into four stages, which are initializing power-on, executing instructions, interrupt processing, and exit.

Initializing Power-On

The chip first checks the data on the main processor when powered on. Then, it will allocate the CPU space for running the instruction set. After allocating the CPU space, the built-in internal voltage regulator will be initialized to ensure that the memory, I/O controller, counter timer and other components can work properly. At this time, other analog components such as Lazer ect. can receive corresponding input signals. Next, the built-in interrupt controller will be initialized to prepare for the further operation.

Instructions Execution

When the instructions are received by the chip, the instructions will be analyzed by the instruction decoder to detect whether they are valid instructions. Then the instructions will be processed by the Arithmetic Logic Unit (ALU). This step includes several parts, such as data transfer, data segmentation, binary conversion, data register, data calculation, and so on. After the processing, the instruction can be output as an electrical signal. And these instructions will be saved in the memory for future reference.

Interrupt Processing

When an electrical signal interrupts the CPU, for example, when there is an off-frame signal on the line, the interrupt controller will give the CPU an interrupt signal. Then the CPU enters the interrupt service routine (ISR). At this time, the program counter (PC) will automatically jump to the interruption program. The interruption program is usually used to determine the cause of the interrupt. If the interrupt is caused by a certain event, the CPU will execute a certain control instruction, such as sending a certain signal. After the control instruction is executed, the CPU will return to the main program and continue to execute the instructions.

Exit

When the CPU finishes executing all the instructions, it will exit, and then enter the power-down mode. At this time, the chip will stop the power supply, stop the calculation of the instruction, enter the sleep state and reduce the power consumption, so as to realize energy saving and consumption reduction.

Conclusion

The SAF-XC878CM-16FFI 5V AA has the advantages of high performance, low power consumption and strong stability, which makes it widely used in automotive electronics, domestic electronic appliances, office automation and other aspects. The above is its application field and working principle. We believe that it will be gradually improved in the future, and will be able to bring more convenience to us.