CHAPTER 4 I/O PORTS

●Operation when a reset is performed

When the CPU is reset, the bits of the DDR3 register are initialized to "0", at which time the output

transistors become OFF (input port mode) and the pins become Hi-Z.

However, CPU resets do not initialize the PDR3 register. If a pin is used as an output port after the reset,

reinitialize the PDR3 register to contain new output data in the bit position corresponding to the pin and

then set the corresponding bit of the DDR3 register so that the pin will function as an output port.

●Operation in stop mode

When the pin state setting bit of the standby control register (STBC: SPL) is set to "1" and when the stop

mode is entered, the pin becomes Hi-Z because the output transistor is turned OFF regardless of the value

existing on the DDR3 register in the bit position corresponding to the pin.

Table 4.3-4summarizes the operating modes of the pins of port 3.

Table 4.3-4 Operating Modes of Pins of Port 3

Pin name

Normal operation, sleep, stop

Stop (SPL = 1)

At a reset

(SPL = 0)

 

 

 

 

 

 

 

P30/UCK/SCK

General-purpose I/O port may also

 

 

to

Hi-Z

 

serve I/O for peripherals

 

P33/EC, P37/BZ/PPG

 

 

 

 

Hi-Z

 

 

 

P34/TO/INT10

General-purpose I/O port may also

Hi-Z

 

to

serve outputs from peripherals and

 

(External interrupt input)

 

P36/INT12

external interrupt inputs

 

 

 

 

 

 

 

SPL : Pin state setting bit of standby control register (STBC: SPL)

Hi-Z: High impedance

Note:

When the pull-up resistor is selected by using the pull-up setting register, the pin state will be "H" level instead of Hi-Z in stop mode (SPL = 1). During a reset, however, the pull-up is invalid with the pin remaining at Hi-Z.

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Fujitsu F202RA, MB89202 manual Operation when a reset is performed, P30/UCK/SCK
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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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