CHAPTER 14 8-BIT SERIAL I/O

14.7Operations of Serial Input Functions

In the 8-bit serial I/O, 8-bit serial input operation synchronized with a shift clock is possible.

Serial Input Operation

Serial input operation is divided into serial input operation with an internal shift clock and serial input operation with an external shift clock. When serial I/O operation is allowed, serial data is input in the SDR and, at the same time, the contents of the SDR are output to the serial data output pin (SO).

Serial input operation using internal shift clock

Serial input operation with the internal shift clock requires the settings shown in Figure 14.7-1 .

Figure 14.7-1 Settings Required for Serial Input Operation using Internal Shift Clock

 

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

SMR

SIOF

SIOE

SCKE

SOE

CKS1

CKS0

BDS

SST

 

 

 

1

 

Other than 11

 

1

 

 

 

 

 

 

 

SDR

 

 

Reception data storage

 

 

 

DDR3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

SSEL

 

 

 

 

 

 

 

SSEL

 

 

 

 

 

 

 

 

1

: Used bit

 

0 : Set "0"

 

 

 

 

 

: Unused bit

 

1 : Set "1"

 

 

 

 

 

When serial input operation is started, the value of the serial data input pin (SI) is captured and held in the SDR in synchronization with the rising edge of the selected internal shift clock. In this case, the SDR of the transfer destination (serial output side) must already be set and the transfer destination must be in the external shift clock input wait state.

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Fujitsu F202RA, MB89202 manual Operations of Serial Input Functions, Serial input operation using internal shift clock

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.