External Reset Pin | Fujitsu F202RA, MB89202 specs

CHAPTER 3 CPU

3.5.2External Reset Pin

The external reset pin generates a reset by "L" level input. When an option setting for enabling reset output is selected, the "L" level signal is output depending on the internal reset source.

■Block Diagram of External Reset Pin

The external reset pin (RST) on models with supported reset output has hysteresis input and pull-up N-ch open drain output.

The external reset pin on models without supported reset output is used only as the pin dedicated to reset input.

Figure 3.5-2is a block diagram of the external reset pin.

Figure 3.5-2 Block Diagram of External Reset Pin

Pull-up resistor Approx. 50kΩ for 5 V

(Not available for

MB89F202)	P-ch
MB89F202)
Pin	Internal reset source
RST
	N-ch
	Internal reset signal

■Function of the External Reset Pin

The external reset pin (RST) generates an internal reset signal by making use of "L" level input.

The RST outputs the "L" level signal according to the internal reset source and oscillation stabilization wait time applied following a reset. The internal reset source may be software reset, watchdog reset, or power- on reset.

Note:

External reset input is accepted asynchronously regardless of the internal clock.

Initialization of the internal circuits requires a clock. In particular, for operations with an external clock, the clock must be input when a reset signal is input.

Internal pull-up control for RST is not available for MB89F202/F202RA. To ensure proper external reset control in MB89F202/F202RA, an external pull-up (recommend 100 kΩ) for RST pin must be required.

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.

Fujitsu F202RA, MB89202 manual Function of the External Reset Pin

Models: F202RA MB89202