CHAPTER 4 I/O PORTS

4.3Port 3

Port 3 is a general-purpose I/O port and may also serve as input pins for external interrupts as well as input and output pins for peripherals.

This section mainly explains the general-purpose I/O function of the port.

This section also describes port 3 concerning to the structure, pins, a block diagram of pins, and associated registers.

■Structure of Port 3

Port 3 comprises the following four elements:

•General-purpose I/O pins, external interrupt 1 input pins, and input/output pins for peripherals (P30/ UCK/SCK to P37/BZ/PPG)

•Port 3 data register (PDR3)

•Port 3 data direction register (DDR3)

•Port 3 pull-up setting register (PUL3)

■Pins of Port 3

Port 3 has eight CMOS I/O pins. These pins can be used as both input pins and external interrupt input pins at the same time. These pins cannot be used as a general-purpose I/O port when being used for peripherals.

Table 4.3-1lists the pins of port 3.

Table 4.3-1 Pins of Port 3

Port

Pin name

Function

Peripherals for which the pin may serve

Input and output form

Circuit

 

 

name

Input

Output

type

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P30/UCK/SCK

P30 general-purpose

UCK

UART clock I/O

CMOS

 

B

 

I/O

SCK

8-bit serial I/O clock I/O

hysteresis

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P31/UO/SO

P31 general-purpose

UO

UART data output

CMOS

 

E

 

I/O

SO

8-bit serial I/O data output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P32/UI/SI

P32 general-purpose

UI

UART data input

CMOS

 

 

 

I/O

SI

8-bit serial I/O data input

hysteresis

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P33/EC

P33 general-purpose

EC

8/16-bit timer and counter clock inputs

 

 

 

 

I/O

 

 

 

 

 

 

 

 

 

 

Port 3

 

 

 

 

 

CMOS

 

P34/TO/INT10

P34 general-purpose

TO

8/16-bit timer and counter timer outputs

 

B

 

 

 

 

I/O

INT10

External interrupt input 10

 

 

 

 

CMOS

 

 

 

 

 

 

 

 

 

 

P35/INT11

P35 general-purpose

INT11

External interrupt input 11

hysteresis

 

 

 

 

 

 

 

I/O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P36/INT12

P36 general-purpose

INT12

External interrupt input 12

 

 

 

 

I/O

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P37/BZ/PPG

P37 general-purpose

BZ

Buzzer output

CMOS

 

E

 

I/O

PPG

12-bit PPG output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For circuit type, see "1.7 Pin Functions Description ".

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Fujitsu MB89202, F202RA manual Pins of Port, Input and output form Circuit Name Output Type
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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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