CHAPTER 5 TIME-BASE TIMER

5.6Notes on Using Time-base Timer

Notes on using the time-base timer are shown below.

■Notes on Using Time-base Timer

●Notes on using programs to set time-base timer

When the interrupt request flag bit (TBTC: TBOF) is "1" and the interrupt request enable bit is enabled

(TBTC: TBIE = 1), a return from interrupt handling is not possible. The TBOF bit must be cleared.

●Clearing time-base timer

The time-base timer is cleared when the time-base timer initialization bit is set to 0 (TBTC: TBR = 0) or when the oscillation stabilization time is required. Because the time-base timer is used as the count clock for the watchdog timer, clearing the time-base timer also clears the watchdog timer.

●Using time-base timer as oscillation stabilization time timer

Oscillation has not yet started in stop mode or when the power is turned on. Therefore, the time-base timer makes oscillation stabilization wait time after the resonator starts operating.

The appropriate oscillation stabilization time must be selected according to the type of resonator connected to the resonator (clock generator).

See Section "3.6.1 Clock Generator ".

●Notes on peripheral functions the time-base timer supplies to the clock

When entering the modes in which oscillation stops, the counter is cleared and the time-base timer stops operating. The clock from the time-base timer may have a shorter "H" level period or longer "L" level period (up to half the clock cycle) when the counter of the time-base timer is cleared because the clock starts operating from the initial state. The clock for the watchdog timer also starts operating from the initial state, but the watchdog timer operates at a normal cycle because the watchdog timer counter is cleared at the same time.

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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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