B.2 Special Instructions

This section describes the special instructions other than addressing.

■Special Instructions

●JMP @A

By this instruction, the control branches to PC (program counter) using the contents of A (accumulator) as the address. N items of jump destinations have been listed on the table, one of which is selected and transferred to A. Executing this instruction can achieve N kinds of branch processing.

Figure B.2-1shows an overview.

Figure B.2-1 JMP @A

(Before execution)

(After execution)

 

 

 

 

 

 

A

1234H

 

A

1234H

 

Old PC

 

 

 

 

XXXXH

 

New PC

1234H

 

 

 

 

 

 

 

●MOVW A, PC

This instruction performs the opposite operation of JMP @A. In other words, the contents of the PC are stored in A. When this instruction has been executed in the main routine and a specific subroutine is to be called, it is possible to verify that the contents of A are the predetermined value in the subroutine. It is also possible to verify that the branch was not from an unexpected part, so it is useful in judging that a runaway has occurred.

Figure B.2-2shows an overview.

Figure B.2-2 MOVW A, PC

(Before execution)

(After execution)

 

 

 

 

 

 

A

XXXXH

 

A

1234H

 

Old PC

 

 

 

 

1233H

 

New PC

1234H

 

 

 

 

 

 

 

When this instruction is executed, the contents of A are not the address holding the operation code of this instruction but the same value as the address holding the next instruction. In Figure B.2-2 , therefore, the value stored in A, 1234H, is the same as the address holding the operation code next to the MOVW A, PC.

387

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Fujitsu F202RA, MB89202 manual Special Instructions, Jmp @A, Movw A, PC
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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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