CHAPTER 2 HANDLING DEVICES

2.1Precautions on Handling Devices

This section describes the precautions to be taken when handling the power supply voltage, pins, and other device items.

■Precautions on Handling Devices

●Ensure that the voltage does not exceed the maximum ratings. (Preventing latch-up)

A latch-up may occur if a voltage higher than Vcc or lower than Vss is applied to input or output pins other than middle- or high-level resistant pins, or if voltage exceeding the rated value is applied between Vcc and Vss.

When a latch-up occurs, the supply current increases rapidly, occasionally resulting in overheating. Therefore, ensure that the voltage does not exceed the maximum ratings when using the microcontrollers.

●Stabilize the supply voltage as much as possible

Although the specified Vcc supply voltage operating range is assured, a sudden change in the supply voltage within the specified range may result in a malfunction.

The following stabilization guidelines are recommended: The Vcc ripple (P-P value) at the supply frequency (50 Hz to 60 Hz) should be less than 10% of the typical Vcc value, and the transient fluctuation rate should be less than 0.1 V/ms at the time of momentary fluctuation when switching the power supply.

●Handling unused input pins

Leaving unused input pins open may result in a malfunction or equipment damage due to a latch-up. Therefore, set these pins to pull-up or pull-down via resistors of 2 kΩ or higher.

●Handling the N.C. pins

Ensure that the N.C. (internally connected) pins are opened before using.

●Precautions on using an external clock

When an external clock is used, the oscillation stabilization wait time is also provided for power-on reset and stop mode release.

●Wild register function

Because wild registers cannot be debugged on MB89V201, check operation on an actual MB89F202/ F202RA.

●Program execution on RAM

When MB89V201 is used, a program cannot be executed on RAM.

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Fujitsu MB89202, F202RA manual Precautions on Handling Devices
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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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