CHAPTER 13 UART

13.5Interrupt of UART

UART supports the interrupt-related error flag bit (ORFE), received data flag bit (RDRF), and transmitted data flag bit (TDRE), and the following interrupt sources:

•When received data is sent from the reception shift register to the serial input data register (SIDR). (Reception interrupt)

•When transmitted data is sent from the serial output data register (SODR) to the transmission shift register. (Transmission interrupt)

■Transmission Interrupt

When the SSD register is read and the output data is written into the SODR register, the data written into the SODR register is transferred to the internal transmission shift register. When next data becomes writable, the TDRE bit is set to "1", then an interrupt request to the CPU (IRQ5) is generated if the transmission interrupt is enabled (SSD: TIE = 1).

■Reception Interrupt

●When operating mode is 0, 1, or 3

When data is correctly input up to the stop bit, the RDRF bit is set to "1". If an overrun error or framing error occurs, the ORFE bit is set to "1".

These bits are set when a stop bit is detected. If the reception interrupt is enabled (SSD: RIE = 1), an interrupt request to the CPU (IRQ6) is generated.

●When operating mode is 2

For both RDRF and ORFE, data is received or transmitted with the final data bit (D8) set to "1", these flags go on when the stop bit at the end is detected. However, when the framing error occurs, the flag goes on regardless of the final data bit. An interrupt request to the CPU is generated when the flag goes on and the input data becomes "1".

■UART Interrupt Related Registers and Vector Table Addresses

Table 13.5-1provides the registers relating to the UART interrupts and vector table addresses. For details of the interrupt operation, see Section "3.4.2 Steps in the Interrupt Operation ".

Table 13.5-1 UART Interrupt Related Registers and Vector Table Addresses

 

Interrupt level setting register

Vector table address

Interrupt name

 

 

 

 

 

 

Register

 

Bit

Upper digits

Lower digits

 

 

 

 

 

 

 

 

 

IRQ5

ILR2 (007CH)

L51 (bit3)

 

L50 (bit2)

FFF0H

FFF1H

 

 

 

 

 

 

 

IRQ6

ILR2 (007CH)

L61 (bit5)

 

L60 (bit4)

FFEEH

FFEFH

 

 

 

 

 

 

 

303

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Fujitsu F202RA manual Interrupt of Uart, Reception Interrupt, Uart Interrupt Related Registers and Vector Table Addresses
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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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