CHAPTER 16 WILD REGISTER FUNCTION

16.1Overview of the Wild Register Function

The wild register function is a function for patching the faulty part of a program by setting the address and the correct data in the incorporated registers. Up to two bytes of data correction is possible.

■Wild Register Function

The wild register function assigns an address in the ROM area of the microcontroller and replaces the existing data corresponding to the address, with new data. For example, if an error exists in a program, setting the address of the faulty part and correction data to the register can correct the faulty data.

■Wild Register Applicable Addresses

The address area where the wild register function can apply varies slightly with the models. Table 16.1-1shows the wild register applicable addresses for each model.

Table 16.1-1 Wild Register Applicable Addresses

Model name

ROM area

 

 

MB89V201

8000H to FFFFH

 

 

MB89202/F202

C000H to FFFFH

 

 

Note:

The wild register function cannot be debugged with a tool. Perform the operation check of the wild register on the actual microcontroller, MB89202/F202/F202RA.

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Fujitsu MB89202, F202RA Overview of the Wild Register Function, Wild Register Applicable Addresses, Model name ROM area
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F202RA, MB89202 specifications

The Fujitsu MB89202 and F202RA microcontrollers are part of the 16-bit microcontroller family, renowned for their robust performance and versatility in a variety of embedded system applications. These devices are tailored for high-efficiency operation across diverse industries, including automotive, consumer electronics, and industrial automation.

One of the main features of the MB89202 is its powerful CPU core, which operates at a clock speed of up to 20 MHz. This enables the microcontroller to perform complex calculations and consumer-grade applications seamlessly. The architecture is designed to handle multiple tasks effectively, making it suitable for real-time operations.

Memory capacity is a vital characteristic of the MB89202, featuring on-chip RAM and ROM configurations. The microcontroller can accommodate different memory variants, providing developers with flexibility in memory allocation based on their application requirements. This adaptability facilitates applications ranging from simple control systems to complex data processing tasks.

The F202RA variant extends the capabilities of the MB89202 by integrating advanced peripheral functions. It includes built-in timers, A/D converters, and serial communication interfaces, which are essential for interfacing with other hardware components or sensors. The availability of these peripherals reduces the need for additional external circuits, thus contributing to a more compact and cost-effective design.

In terms of power management, the MB89202 series employs advanced power-saving technologies. The microcontroller offers various low-power modes, enabling devices to conserve energy during idle times, making it highly suitable for battery-operated applications. This characteristic not only enhances the efficiency of devices but also extends their operational lifespan.

Moreover, the Fujitsu MB89202 series incorporates robust protection features, including watchdog timers and failure detection mechanisms. These safety features ensure reliable operation in critical systems, making them a preferred choice in applications where failure is not an option.

The MB89202 and F202RA microcontrollers also support a range of development tools and environments, including integrated development environments (IDEs) and software libraries, which facilitate rapid application development. With these tools, developers can efficiently prototype, debug, and optimize their applications.

In summary, the Fujitsu MB89202 and F202RA microcontrollers stand out with their efficient performance, extensive memory options, integrated peripherals, and power-saving capabilities, making them ideal for a wide array of embedded applications. Their reliability and robustness further enhance their attractiveness for designers seeking advanced microcontroller solutions.
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