MC68HC908JB16JDW

Embedded - Microcontrollers

The MC68HC908JB16JDW is a family of 8-bit microcontrollers designed and manufactured by Freescale Semiconductor, formerly known as Motorola and Motorola Semiconductor. The MC68HC908JB16JDW is a high performance, low power, and low cost device for general embedded applications. It is based on the 8-bit HCS08 processor core and includes 16KB of Flash memory, 1KB of RAM Memory, 60 I/O pins, an Advanced High-performance Bus (AHB) clock of up to 25MHz, on-chip peripherals, and other features.

Application Fields of the MC68HC908JB16JDW

The MC68HC908JB16JDW has a wide range of applications in embedded systems, typically in consumer electronics, automotive, industrial, and medical markets. In consumer electronics, it can be used in digital TVs, DVD players, as well as security and intelligent home appliances. In automotive, it can be used in car audio systems, engine control, and in car navigation systems. In industrial, it can be used in motor control applications, process or instrument control, and smart factory automation. In the medical industry, the MC68HC908JB16JDW can be used in patient vital monitoring, imaging systems, and drug infusion systems.

Working Principle of the MC68HC908JB16JDW

The MC68HC908JB16JDW is an 8-bit microcontrollers, and its working principle is similar to other microcontroller devices: it includes an 8-bit core processor, memory, input/output (I/O) peripherals such as analog to digital converters, timers, serial ports, and other circuitry to connect to external components. The processor inside the MC68HC908JB16JDW is based on a reduced instruction set computer (RISC) architecture, and it has a total of 16 registers. The processor uses a von Neumann architecture with a single address/data bus output. The clock frequency of the processor is up to 25MHz.

The MC68HC908JB16JDW also includes six memory units, namely the Flash Program Memory, the Data Flash Memory, SRAM Memory, Code Shadow section, ROM Shadow Section, and Monitor ROM. The Flash Memory is used to store the microcontroller program instructions and data. The Data Flash Memory is used to store data and is not directly accessed by the CPU; instead, the CPU accesses the Data Flash memory through the instructions specific to the MC68HC908JB16JDW chip. The SRAM Memory is used to store data and is directly accessible by the CPU. The Code Shadow section is used to store the program code for running the program in the Flash Memory. The ROM Shadow section is used to store the special functions of the processor. Lastly, the Monitor ROM is used to store the bootloader program which is used to configure the microcontroller system at startup.

The MC68HC908JB16JDW includes peripherals for I/O operations, such as UART (Universal Asynchronous Receiver/Transmitter) for serial communication, A/D converter (Analog to Digital Converter) for analog data conversion, and timers for delaying operations. The I/O pins of the chip can be used to interface with external devices such as LCD displays, keypads, and sensors. In addition, the chip also contains functionality to sense and monitor the power supply voltage and temperature, and it can generate reset signals in the case of any fault or abnormality.

The MC68HC908JB16JDW also supports other important features, including the self-programmable Flash Memory which allows the user to write and update the program code easily. It also supports low-voltage programming for programming the Flash Memory without high-voltage programming pins. Lastly, the device is RoHS compliant and is EMC approved.

Conclusion

The MC68HC908JB16JDW is a high performance, low power, and low cost 8-bit microcontroller designed and manufactured by Freescale Semiconductor. It is suitable for embedded applications in consumer electronics, automotive, industrial, and medical markets. The MC68HC908JB16JDW has a wide range of features, including I/O peripherals for serial communication, data conversion, and monitoring. It also includes self-programmable Flash Memory, power and temperature sensing, reset signal generation, and RoHS and EMC compliance. The device is reliable and easy to use, making it an ideal choice for embedded applications.