CHAPTER 14 8-BIT SERIAL I/O

14.5Interrupt of 8-Bit Serial I/O

An 8-bit serial I/O interrupt is caused by completion of 8-bit serial data I/O.

■Interrupt at Serial I/O Operation

In the 8-bit serial I/O, serial output operation and serial input operation are performed at the same time. When serial I/O transfer is started, the values in the serial data register (SDR) are input and output on a per bit basis in synchronization with the set shift clock cycle. When the shift clock of the 8th bit rises, the interrupt request flag bit (SMR: SIOF) is set to "1".

In this case, when the interrupt request output allowance bit is allowed (SMR: SIOE = 1), the interrupt request (IRQC) for CPU interrupt occurs.

Write "0" to the SIOF bit with the interrupt processing routine and clear the interrupt request. When 8-bit serial output is completed, the SIOF bit is set irrespective of the SIOE bit value.

If serial I/O transfer stop (SMR: SST = 0) and serial data transfer termination take place at the same time

during serial I/O operation, the interrupt request flag bit (SMR: SIOF = 1). If the SIOE bit is allowed (0 → 1), however, the interrupt request occurs immediately.

■8-bit Serial I/O Interrupt Register and Vector Table

Table 14.5-1 8-bit Serial I/O Interrupt Register and Vector Table

 

Interrupt level setting register

Vector table address

Interrupt name

 

 

 

 

 

Register

Setting bit

Higher

Lower

 

 

 

 

 

 

 

IRQC

ILR4 (007EH)

LC1 (bit1)

LC0 (bit0)

FFE2H

FFE3H

 

 

 

 

 

 

For interrupt operation, see Section "3.4.2 Steps in the Interrupt Operation ".

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Fujitsu MB89202, F202RA manual Interrupt of 8-Bit Serial I/O, Bit Serial I/O Interrupt Register and Vector Table
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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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