Registers of Port 3 PDR3, DDR3, PUL3 | Fujitsu MB89202, F202RA

CHAPTER 4 I/O PORTS

4.3.1Registers of Port 3 (PDR3, DDR3, PUL3)

This section describes the registers associated with port 3.

■Functions of Port 3 Registers

●Port 3 data register (PDR3)

The PDR3 register indicates the state of the pins. For a pin set to function as an output port, the same value ("0" or "1") as held by the output latch can be read from this register. If the pin is set to function as an input port, however, its output latch value cannot be read from the register.

Note:

When a bit manipulation instruction (SETB, CLRB) is executed, the output latch values, not the value states of the pins, are read; thus, output latch values, excepting those for bits to be manipulated, do not change.

●Port 3 data direction register (DDR3)

The DDR3 register sets the I/O direction of each pin per bit.

When a bit of the DDR3 corresponding to a pin of port 3 is set to "1", the pin functions as an output port. When the bit is set to "0", the pin functions as an input port.

Note:

Because the DDR3 register is write only, bit manipulation instructions (SETB, CLRB) do not apply.

●Setting a port pin to serve external interrupts

If a pin of port 3 is used as an external interrupt input pin, enable the external interrupt circuit operation and set the pin to function as an input port.

When the pin is set in this mode, its output latch value has no significance.

●Setting the output from a peripheral enable

If a peripheral with an output pin is used, set the output enable bit of the peripheral enable.

Because the output from the peripheral has priority, the values set on the PDR3 and DDR3 registers in the bit position corresponding to the output pin for the peripheral have no significance, regardless of the value output from the peripheral and the output enabled.

●Setting the input to a peripheral enable

If a peripheral with an input pin is used, set the pin of port 3 for the input to the peripheral to function as an input port. In this mode, the corresponding output latch value has no significance.

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.

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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.

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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.

Fujitsu MB89202, F202RA manual Registers of Port 3 PDR3, DDR3, PUL3, Port 3 data register PDR3

Models: F202RA MB89202