APPENDIX B Overview of the Instructions

●MULU A

This instruction multiplies AL (the lower eight bits of accumulator) by TL (the lower eight bits of the temporary accumulator) without a sign and stores the results in 16 bits length to A. The contents of T (temporary accumulator) remain as they are. For the operation, the contents of AH (the higher eight bits of accumulator) and TH (the higher eight bits of temporary accumulator) before the execution are not used. Take care when using a branch based on the result of multiplication because the flags were not changed.

Figure B.2-3shows an overview.

Figure B.2-3 MULU A

(Before execution)

(After execution)

 

 

 

 

 

 

A

5678H

 

A

1860H

 

 

 

 

 

 

T

1234H

 

T

1234H

 

 

 

 

 

 

 

●DIVU A

This instruction divides T of 16 bits by AL of 8 bits without a sign, stores the results in 8 bits to AL, and stores the remainder of 8 bits to TL. Both AH and TH become 0. For the operation, the contents of AH before execution are not used. If the results exceed 8 bits, they are not guaranteed. Also, the fact that the results exceeded 8 bits is not indicated. So when using data units that may cause this type of situation, judge them in advance.

Take care when using a branch based on the result of division, because the flags were not changed.

Figure B.2-4shows an overview.

Figure B.2-4 DIVU A

(Before execution)

(After execution)

 

 

 

 

 

 

A

5678H

 

A

0034H

 

 

 

 

 

 

T

1862H

 

T

0002H

 

 

 

 

 

 

 

388

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Fujitsu MB89202, F202RA manual Mulu a, Divu a, 388
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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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