CHAPTER 15 BUZZER OUTPUT

15.1Overview of the Buzzer Output

For the buzzer output, four kinds of output frequencies (square waves) can be selected. The buzzer output may be used for the confirmation tone of key input and other tones.

■Buzzer Output Function

The buzzer output function is a function for outputting a signal (square wave) used for tones such as a confirmation tone.

For the buzzer output, it is selectable whether to output one of four output frequencies or to disable the output.

As the buzzer output, four kinds of divided-frequency outputs are supplied from the time-base timer.

Note:

The time-base timer supplies clock for the buzzer output. Therefore, buzzer output will be affected when time-base timer is cleared.

Table 15.1-1lists the four kinds of output frequencies (square waves) specifiable for the buzzer output.

Table 15.1-1 Output Frequencies

Clock supplier

 

Buzzer output

Square wave output (at 12.5 MHz)

 

 

 

 

 

 

213/FCH

FCH/213 (1.526 kHz)

 

 

 

 

time-base timer

 

212/FCH

FCH/212 (3.052 kHz)

 

 

 

 

211/FCH

FCH/211 (6.104 kHz)

 

 

 

 

 

 

 

 

210/FCH

FCH/210 (12.21 kHz)

 

 

 

 

FCH: Oscillation frequency

 

 

Note:

Calculation example of an output frequency

If time-base timer output FCH/210 is selected in the buzzer register (BZCR) (BZ2=1, BZ1=0, and BZ0=0) and the oscillation (FCH) is 12.5 MHz, the output frequency being output from the BZ pin is calculated as follows:

Output frequency = FCH/210

= 12.5 MHz/1024 12.21 kHz

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Fujitsu MB89202, F202RA manual Overview of the Buzzer Output, Output Frequencies
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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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