CHAPTER 11 EXTERNAL INTERRUPT CIRCUIT 2 (LEVEL)

11.1Overview of External Interrupt Circuit 2

External interrupt circuit 2 detects the predetermined level of a signal input to any of the eight external interrupt pins and generates and issues an interrupt request to the CPU.

■Functions of External Interrupt Circuit 2 (Level Detection)

External interrupt circuit 2 functions to detect an "L" level signal input to any of the external interrupt pins and generate and issue an interrupt request to the CPU, thereby enabling recovery from standby mode and a transition to normal operating state (main clock operation mode).

•External interrupt pins: Eight pins (P00/INT20/AN4 to P03/INT23/AN7, P04/INT24 to P07/INT27)

•External interrupt triggering: Input of an "L" level signal to one of the above external interrupt pins triggers an external interrupt.

•Interrupt control: An external interrupt 2 control register (EIE2) enables or disables external interrupt inputs.

•Interrupt flag:Detection of the "L" level is indicated by an external interrupt request flag bit of the external interrupt 2 flag register (EIF2).

•Interrupt request: An interrupt request is generated if the state of one of the above external interrupt pins is "L" (IRQA).

244

Page 259 Page 261
Page 260
Image 260
Fujitsu MB89202, F202RA manual Overview of External Interrupt Circuit, External Interrupt Circuit 2 Level
Page 259 Page 261

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.
Top Page Image Contents