●XCHW A, PC

This instruction replaces the contents of A and the contents of PC, resulting in a branch to the address indicated by the contents of A before execution. The contents of A after execution become the value of the address next to the address holding the operation code, XCHW A, PC. This instruction is useful especially when a table is specified in the main routine and a subroutine uses it.

Figure B.2-5shows an overview.

Figure B.2-5 XCHW A, PC

(Before execution)

(After execution)

 

 

 

 

 

 

A

5678H

 

A

1235H

 

 

 

 

 

 

PC

1234H

 

PC

5678H

 

 

 

 

 

 

 

After execution of this instruction, the contents of A do not become the address holding the operation code of this instruction. Instead, they are the same as the address holding the next instruction. In Figure B.2-5 , therefore, the value stored in A is 1235H, agreeing with the address holding the operation code next to XCHW A, PC. Note that it is not 1234H but 1235H.

Figure B.2-6shows an example of assembler coding.

Figure B.2-6 Usage Example of XCHW A, PC

(Main routine)

(Subroutine)

 

 

 

.

 

 

 

 

.

 

 

 

 

.

 

 

 

MOVW

A, #PUTSUB

PUTSUB

XCHW A, EP

 

XCHW

A, PC

 

PUSHW A

 

DB

'PUT OUT DATA', EOL

PTS1

MOV A, @EP

 

MOVW

A, 1234H

 

INCW EP

 

 

.

 

MOV IO, A

Outputs a

 

.

 

 

table data

 

.

 

CMP A, #EOL

unit.

 

 

 

BNE PTS1

POPW A

XCHW A, EP

JMP @A

389

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Fujitsu F202RA, MB89202 manual Xchw A, PC, 389
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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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