CHAPTER 14 8-BIT SERIAL I/O

Table 14.4-1 Explanation of Functions of Each Bit in Serial Mode Register (SMR) (2/2)

 

Bit name

Function

 

 

 

 

 

This bit is used to select whether to transfer serial data, starting at the lowest

 

 

bit (LSB first, BDS = 0) or the highest bit (MSB first, BDS = 1). When this

 

BDS:

bit is set to "0", serial data is transferred, starting at the lowest bit. When it is

bit1

Transfer direction

set to "1", serial data is transferred, starting at the highest bit.

 

selection bit

Note:

 

 

If this bit is rewritten after serial data has been written to the SDR to

 

 

replace higher data with lower data, the data in the SDR becomes invalid.

 

 

 

 

 

• This bit is used to control serial I/O transfer start and allowance. It can

 

 

also be used to judge whether serial I/O transfer terminated.

 

 

• If this bit is set to "1" when the internal shift clock is selected (when the

 

 

CKS1 and CKS0 bits are not 11B), the shift clock counter is cleared and

 

 

serial I/O transfer is started.

 

 

• If this bit is set to "1" when the external shift clock is selected (when the

 

SST:

CKS1 and CKS0 bits are 11B), serial I/O transfer is allowed and the shift

bit0

clock counter is cleared. The transfer side enters the external shift clock

Serial I/O transfer start bit

input wait state.

 

 

 

• When serial I/O transfer terminates, this bit is set (cleared) to "0" and the

 

 

SIOF bit is set to "1".

 

 

• If this bit is set to "0" during serial I/O transfer (SST = 1), serial I/O

 

 

transfer is suspended.

 

 

When serial I/O transfer is suspended, it is necessary to reset the SDR of

 

 

the data output side and restart data input side transfer (clear the shift

 

 

clock counter).

 

 

 

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Fujitsu MB89202, F202RA manual Bds, Sst, 322
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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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