CHAPTER 14 8-BIT SERIAL I/O

14.4.2Serial Data Register (SDR)

The serial data register (SDR) retains 8-bit serial I/O transfer data. The SDR functions as a transmission data register at serial output operation. It functions as a reception data register at serial input operation.

■Serial Data Register (SDR)

Figure 14.4-3shows the bit structure of the SDR.

 

 

 

 

Figure 14.4-3

Serial Data Register (SDR)

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

 

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Initial value

003AH

 

 

 

 

 

 

 

 

 

 

 

XXXXXXXXB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

 

R/W

: Readable and Writable

 

 

 

 

 

 

X

: Undefined

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

●At serial output operation

The SDR functions as a transmission data register at serial output operation. When serial I/O transfer is started (SMR: SST = 1), the 8-bit serial data written to the SDR is transferred. Transmission data does not remain in the SDR because it is shifted out via serial I/O transfer.

●At serial input operation

The SDR functions as a reception data register. When serial I/O transfer is started (SMR: SST = 1), the serially transferred reception data is stored in the SDR.

●When the serial I/O is in transfer operation

When the serial I/O is in transfer operation, do not write data to the SDR. Moreover, note that the read values have no significance.

When serial output and serial input are allowed at the same time, serial I/O operation is performed.

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Fujitsu F202RA, MB89202 manual Serial Data Register SDR, At serial output operation, At serial input operation
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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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