Oscillation Stabilization Wait Time | Fujitsu MB89202, F202RA

CHAPTER 3 CPU

3.6.5Oscillation Stabilization Wait Time

Oscillation stabilization wait time is to be applied when power is turned on to start the clock in RUN mode while the clock is stopped in stop mode.

■Oscillation Stabilization Wait Time

A ceramic or crystal resonator normally requires several or several tens of milli-seconds from oscillation start to oscillation stabilization at a specific cycle (oscillation frequency).

Thus, CPU operation must be prohibited immediately after the start of oscillation, and the clock is to be supplied to the CPU when oscillation is stable following the expiration of oscillation stabilization wait time.

The period during which oscillation becomes stable is dependent on the type of oscillator (such as crystal or ceramic) connected to the oscillation circuit (clock generator). Therefore, an oscillation stabilization wait time setting appropriate to the oscillator used must be selected.

Figure 3.6-6shows changes in a frequency generated by an resonator from generation to stabilization.

Figure 3.6-6 Changes of a Frequency after Generation

Duration required for a resonator starts oscillation

Oscillation stabilization wait time

Normal operation

Return from stop mode or reset operation

Start of oscillation

Oscillation stabilizes

■Oscillation Stabilization Wait Time

Oscillation stabilization wait time is to be applied to start the clock in active mode while the clock is stopped.

Oscillation stabilization wait time is the duration from when the counter of the time-base timer is cleared to when the specified bits overflow.

●Oscillation stabilization wait time during operation

For oscillation stabilization wait time applied for a return from stop mode to active (RUN) mode due to external interrupt, one of three oscillation stabilization wait time settings can be selected using the oscillation stabilization wait time selection bits in the system clock control register (SYCC: WT1 and WT0).

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 MB89202, F202RA manual Oscillation Stabilization Wait Time

Models: F202RA MB89202