Clock Mode, Gears Clock Speed Switching Function

CHAPTER 3 CPU

3.6.4Clock Mode

The clock speed is switched by selecting one of four frequency-divided source clocks (gears).

■Operations in Each Clock Mode

Table 3.6-2 Operations in Each Clock Mode

Clock speed			Operating clock in each block
	Standby					Cause that cancels

SYCC register		Clock				standby mode
	mode			time-base	Peripheral
(SYCC: CS1			CPU			(excepting reset)
				timer	function
and CS0)

	High	RUN	FCH/4	FCH/2	FCH/4	Interrupt request
(1, 1)	speed	Sleep	Generated	FCH/2	FCH/4
	speed
			Stopped
			Stopped
		Stop	Stopped	Stopped	Stopped	External interrupt
		RUN	FCH/8	FCH/2	FCH/8	Interrupt request
(1, 0)		Sleep	Generated	FCH/2	FCH/8
(1, 0)		Sleep	Stopped
			Stopped
		Stop	Stopped	Stopped	Stopped	External interrupt
		RUN	FCH/16	FCH/2	FCH/16	Interrupt request
(0, 1)		Sleep	Generated	FCH/2	FCH/16
(0, 1)		Sleep	Stopped
			Stopped
		Stop	Stopped	Stopped	Stopped	External interrupt
		RUN	FCH/64	FCH/2	FCH/64	Interrupt request
(0, 0)		Sleep	Generated	FCH/2	FCH/64
(0, 0)	Low	Sleep	Stopped
	speed		Stopped
	speed	Stop	Stopped	Stopped	Stopped	External interrupt
		Stop	Stopped	Stopped	Stopped	External interrupt

Each clock mode allows transition to a corresponding standby (sleep/stop) mode. For details of standby mode, see Section "3.7 Standby Mode (Low-Power Consumption Mode) ".

■Gears (Clock Speed Switching Function)

Writing one of 00B to 11B into the clock speed selection bits (SYCC: CS1 and CS0) in the system clock control register selects one of four clock speeds.

The CPU and peripheral circuits operate using the clock speed selected. However, the gear does not affect the time-base timer.

Power consumption can be reduced by lowering the clock speed.

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 Gears Clock Speed Switching Function, Operations in Each Clock Mode

Models: F202RA MB89202

CHAPTER 3 CPU

3.6.4Clock Mode

Table 3.6-2 Operations in Each Clock Mode

(SYCC: CS1

CPU

timer

function

and CS0)

■Gears (Clock Speed Switching Function)

F202RA, MB89202 specifications