CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

8.58/16-bit Capture Timer/Counter of Interrupts

The 8/16-bit capture timer/counter generates an interrupt if the values set in a data register match those set in the counter when the interval timer or counter is operating. The interrupt level is IRQ3 when generated by the 8/16-bit capture timer/counter. When the capture is in operation and a capture edge is detected, IRQ4 is generated.

■8/16-bit Capture Timer/Counter of Interrupts

Table 8.5-1shows the interrupt request flag bit, interrupt flag clear bit, interrupt request enable bit, and the

cause of the 8/16-bit capture timer/counter interruption.

Table 8.5-1 Interrupt Control Bits and the Cause of the 8/16-bit Capture Timer/Counter Interrupt

 

8-bit mode

16-bit mode

Capture mode

 

 

 

 

 

 

Timer 0

Timer 1

Timer 0 + timer 1

Timer 0 or timer 0 +

 

timer 1

 

 

 

 

 

 

 

 

 

Interrupt request flag bit

TCR0 : TIF0

TCR1 : TIF1

TCR0 : TIF0

TCCR : CPIF

 

 

 

 

 

Interrupt flag clear bit

TCR0 : TFCR0

TCR1 : TFCR1

TCR0 : TFCR0

TCCR : CFCLR

 

 

 

 

 

Interrupt request enable bit

TCR0 : T0IEN

TCR1 : T1IEN

TCR0 : T0IEN

TCCR : CPIEN

 

 

 

 

 

 

The values in

The values in

The values in

 

Interrupt cause

TDR0 match

TDR1 match

TDR0 and TDR1

A capture edge is

those in the 8-bit

those in the 8-bit

match those in the

detected.

 

 

counter.

counter.

16-bit counter.

 

 

 

 

 

 

In the 8-bit mode, timer 0 and timer 1 independently generats the interrupt request for 8/16-bit capture timer/counter. In the 16-bit mode, timer 0 generates the interrupt request. All basic operations are the same. Timer 0 interrupt operation in the 8-bit mode is explained here.

●Timer 0 interrupt operation in the 8-bit mode

The counter value is incremented according to the selected count clock, starting at 00H. When the counter value matches the value set in the comparator data latch (timer 0 data register (TDR0)) corresponding to the timer 0 data register (TDR0), the compare match detection flag bit (TCR0: TIF0) is set to "1".

In this case, when the interrupt request flag bit is allowed (when TCR0: T0IEN = 1), timer 0 generates an interrupt request (IRQ3) to the CPU. Set the TFCR0 bit to "1" and clear the interrupt request with the interrupt processing routine.

When the counter value matches the value set in the comparator data latch, the TIF0 bit is set to "1" regardless of the TFCR0 bit value.

In the 8-bit mode, timer 0 and timer 1 operate independently, and because they generate the same interrupt request (IRQ3), determination of the interrupt request flag by software may be required.

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Fujitsu F202RA, MB89202 manual 8/16-bit Capture Timer/Counter of Interrupts, Bit mode Capture mode Timer Timer 0 + timer
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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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