Operations of Port 4 Functions | Fujitsu F202RA, MB89202 guide

CHAPTER 4 I/O PORTS

4.4.2Operations of Port 4 Functions

This section describes the operation of port 4.

■Operation of Port 4

●Operation in output port mode

When "1" is written for a bit of the DDR4 register, the bit corresponding to a pin of port 4, the pin functions as an output port.

In output port mode, the output transistor operation is enabled and output latch data is output to the pin.

By setting the bit corresponding to the pin on the OUT4 register, N-ch open-drain or CMOS push-pull type can be selected as the output format of the pin.

Once data has been written into the PDR4 register, the written data is held in the output latch and output to the pin as it is.

The value state of the pin can be read by reading the PDR4 register.

●Analog input mode setting

Set a bit of the DDR4 register to "0", the bit corresponding to a pin of port 4 assigned for desired analog input, so that its output transistor is set to OFF and the pin is set at Hi-Z.

Its output latch value can be read by reading the PDR4 register.

Set the bit of the ADEN register of the A/D converter to "1", the bit corresponding to the analog input pin in use.

●Operation when a reset is performed

When the CPU is reset, the bits of the PDR4 register are initialized to "1". Thus, the output transistors become OFF (input port mode) and the pins become Hi-Z.

●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 DDR4 register in the bit position corresponding to the pin. Input remains fixed to prevent leaks by input open.

Table 4.4-4summarizes the operating modes of the pins of port 4.

Table 4.4-4 Operating Modes of Pins of Port 4

Pin name	Normal operation, sleep, stop (SPL = 0)	Stop (SPL = 1)	At a reset

P40/AN0 to P43/AN3	General-purpose I/O port may also serve I/O	Hi-Z	Hi-Z
P40/AN0 to P43/AN3	for peripherals	Hi-Z	Hi-Z
	for peripherals

SPL : Pin state setting bit of standby control register (STBC: SPL)
Hi-Z: High impedance

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.

Fujitsu F202RA, MB89202 manual Operations of Port 4 Functions, Analog input mode setting

Models: F202RA MB89202