CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

●Free-run mode

Setting the clear mask bits (CCMSK and TCMSK) of TCCR to 11B enables the capture function to operate as the free-run timer.

●Clear mode

Setting the clear mask bits (CCMSK and TCMSK) of TCCR to a value other than 11B enables the capture function to operate as a clear mode.

The clear mode enables the measurement of signal pulse widths and cycles. In this case, using the clear mode with the compare match detection function also enables the determination of signal availability.

Note:

The capture input pin also serves as the external clock input pin. The external clock mode cannot be used in the capture mode.

Table 8.8-1shows the relationship between the counter mode and the compare latch operation according to the clear mask bit value.

Table 8.8-1 Relationship between Counter Mode and Compare Latch Operation

 

 

 

Data load to compare latch and counter clear

 

 

 

 

(provided/not provided)

 

CCMSK

TCMSK

Counter mode

 

 

 

 

At capture edge detection

At compare match

 

 

 

 

 

 

 

 

 

 

 

 

 

Data load

Counter clear

Data load

Counter clear

 

 

 

 

 

 

 

0

0

 

Provided

Provided

Provided

Provided

 

 

 

 

 

 

 

0

1

Clear mode

Provided

Provided

Not provided

Not provided

 

 

 

 

 

 

 

1

0

 

Not provided

Not provided

Provided

Provided

 

 

 

 

 

 

 

1

1

Free-run mode

Not provided

Not provided

Not provided

Not provided

 

 

 

 

 

 

 

194

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Fujitsu MB89202, F202RA manual Ccmsk Tcmsk
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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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