CHAPTER 10 EXTERNAL INTERRUPT CIRCUIT 1 (EDGE)

Table 10.4-2 Explanation of Functions of Each Bit in External Interrupt Control Register 2 (EIC2)

 

Bit name

Function

 

 

 

 

bit7

 

 

• Bit value is undefined when being read.

to

 

Unused bits

 

• Written value does not affect other operations.

bit4

 

 

 

 

 

 

 

 

 

 

 

 

• When a signal with an edge or edges corresponding to edge polarity

 

 

 

selected by edge polarity selection bits 2 (SL21, SL20) is input to the

 

 

EIR2:

INT12 external interrupt pin, this bit is set to "1".

bit3

 

External interrupt

• When this bit and interrupt request enable bit 2 (EIE2) are "1", the

 

 

request flag bit 2

interrupt request is output.

 

 

 

• Writing "0" clears this bit, and writing "1" does not affect this bit (no

 

 

 

change).

 

 

 

 

 

 

 

• These bits are used to select the polarity of an edge or edges of a signal

 

 

 

pulse that triggers an interrupt when the signal is input to the INT12

 

 

 

external interrupt pin.

 

 

SL21, SL20:

• When these bits provide a value of "00B", edge detection is not

bit2

 

performed and interrupt requests are not generated.

 

Edge polarity selection

bit1

 

• These bits may specify "01B", indicating a rising edge, "10B", a falling

 

bits 2

 

 

edge, or "11B", both edges to be detected.

 

 

 

 

 

 

Note:

 

 

 

If edge is selected while edge detection is OFF, edge detection may be

 

 

 

performed unconditionally. Always clear EIR2 bit after selecting an edge.

 

 

 

 

 

 

 

This bit enables or disables interrupt request outputs to the CPU. When this

 

 

 

bit and external interrupt request flag bit 2 (EIR2) are "1", the interrupt

 

 

EIE2:

request is output.

 

 

Notes:

bit0

 

Interrupt request

 

• When using the external interrupt pin, write "0" for bit6 of the port data

 

 

enable bit 2

 

 

direction register (DDR3) so that the pin serves inputs only.

 

 

 

 

 

 

• Regardless of the interrupt request enable bit state, the state of external

 

 

 

interrupt pin can be read directly from the port data register (PDR3).

 

 

 

 

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Fujitsu MB89202, F202RA manual EIR2, EIE2, 236
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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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