CHAPTER 17 FLASH MEMORY

17.4.1Data Polling Flag (DQ7)

The data polling flag uses the data polling function to post that the automatic algorithm is being executed or has terminated

Write

Read-access during execution of the automatic write algorithm causes the flash memory to output the opposite data of bit7 last written, regardless of the value at the address specified by the address signal. Read-access at the end of the automatic write algorithm causes the flash memory to output bit7 of the read value of the address specified by the address signal.

Automatic Erasing

Read-access during execution of the automatic erasing algorithm causes the flash memory to output "0", regardless of the value at the address specified by the address signal. After the automatic erasing algorithm is executed, "1" is output.

Note:

When the automatic algorithm comes to the end of its operation, bit7 (data polling) changes its state asynchronously during a read operation. This means that flash memory sends data about the operation state to bit7 and will then send out fixed data. When flash memory ends the automatic algorithm or even if bit7 is outputting fixed data, the values of the other bits are still undetermined. Fixed data in the other bits can be read by successively executing read operations.

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Fujitsu F202RA, MB89202 manual Data Polling Flag DQ7, Automatic Erasing

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.