Output pin changeover, Resolution | Fujitsu F202RA, MB89202 specification

CHAPTER 9 12-BIT PPG TIMER

9.6Notes on Using 12-bit PPG Timer

This section provides notes on using the 12-bit PPG timer.

■Notes on Using 12-bit PPG Timer

●Output pin changeover

The P37/BZ/PPG pin shares functions of a general-purpose port and a 12-bit PPG output. Because its buzzer output (BZ) function precedes the 12-bit PPG output function, if buzzer outputs are enabled, it functions as the buzzer output (BZ) pin even if PPG outputs are enabled by the RCR23 (RCEN bit). To use it as the 12-bit PPG output (PPG) pin, turn the buzzer outputs OFF.

●Limitation of "H" width setting

Using the "H" width setting bits of the 12-bit PPG control registers 1 and 2 (RCR21:HSC5 to HSC0 and RCR22:HSC11 to HSC6), set a value that falls within the range of "000000000001B" to "111111111111B" (001H to FFFH). If "000H" is set, "H" level outputs are delivered through the PPG pin. Furthermore, set the value of the "H" width so as to be smaller than the value given by the cycle period setting bits of 12-bit PPG control registers 3 and 4 (RCR23:SCL5 to SCL0 and RCR24:SCL11 to SCL6). If the "H" width is equal to or greater than the cycle period, "H" level outputs are always delivered through the PPG pin.

●Resolution

When the cycle period is set at "111111111111B" (FFFH), a maximum "H" width resolution of 1/4095 is obtained. This resolution is reduced as the cycle period setting becomes smaller and limited to a minimum of 1/2 when the cycle period is set at "000000000010B" (002H).

●Setting change during operation

The "H" width setting bits (RCR21:HSC5 to HSC0 and RCR22:HSC11 to HSC6) and the cycle period setting bits (RCR23:SCL5 to SCL0 and RCR24:SCL11 to SCL6) are compared with the 12-bit counter for generating a frequency of 12-bit PPG waveforms. If the set values given by these bits are changed to smaller values during the operation of the counter, a counter overflow occurs, which may extend the cycle period until synchronization with a count by the counter is detected again. Similarly, this may extend the "H" width until synchronization with a count by the counter is detected in the next cycle (cycle period).

Figure 9.6-1illustrates setting change during the operation of the 12-bit PPG timer.

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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.

Fujitsu F202RA This section provides notes on using the 12-bit PPG timer, Output pin changeover

Models: F202RA MB89202