CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER

8.8Functions of Operations of Capture Functions

This section describes the capture function operation of the 8/16-bit capture timer/ counter.

Capture Function Operation

8-bit mode

To operate the capture function in the 8-bit mode, the function must be set as shown in Figure 8.8-1 .

Figure 8.8-1 Setting of Capture Function in 8-bit Mode

DDR3

TCCR

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

CPIF

CFCLR

CPIEN

CCMSK

TCMSK

EDGS1

EDGS0

RESV

 

 

 

 

 

Setting of a value

 

 

 

 

 

 

other than 00

 

TCR1

TIF1

TFCR1 T1IEN

TCS12 TCS11 TCS10 TSTR1

Setting of a value other than 111

TCR0

TIF0 TFCR0 T0IEN CINV TCS02 TCS01 TCS00 TSTR0

Setting of a value other than 111

TCR2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PEN

TSEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TCPL

 

 

 

 

 

 

 

 

Number of detected events

 

: Used bit

 

: Unused bit

0

: Set "0"

The 8-bit capture mode is allowed by the capture mode enable/edge detection selection bits (EDGS1 and EDGS0) of the capture control register (TCCR). "1" is written to the timer start bit (TSTR0) after the clock source selection bits (TCS02, TCS01, and TCS00) of the timer 0 control register (TCR0) have been set.

In the capture mode, the count value is captured to the capture data register (TCPL) each time a capture input edge is detected and the capture edge detection flag (CPIF) is set to "1". In this case, if the capture interrupt enable bit (CPIEN) is already set to "1", an interrupt request is output to the CPU.

The capture mode is divided into free-run mode and clear mode.

193

Page 209
Image 209
Fujitsu F202RA, MB89202 manual Functions of Operations of Capture Functions, Setting of Capture Function in 8-bit Mode

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.