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Intel Microcontroller, 80C196NU, 8XC196NP EPA and PTS Operations for the PWM Remap Mode Example

Models: Microcontroller 80C196NU 8XC196NP

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8XC196NP, 80C196NU USER’S MANUAL

Start

EPA

No Timer

Match

?

Yes

If EPA0, set the output

If EPA1, clear the output

PTS Cycle

If EPA0: EPA0_TIME = EPA0_TIME + T2

If EPA1: EPA1_TIME = EPA1_TIME + T2

Toggle TBIT

(TBIT is not used)

A2553-01

Figure 6-18. EPA and PTS Operations for the PWM Remap Mode Example

You can change the duty cycle by changing the time that the output is high and keeping the period constant. After a timer match occurs for EPA1 (when the output falls), schedule the next EPA1 match for T2 + DT, where DT is the time to be added to the on-time. Thereafter, schedule the next EPA1 match for T2. You can do this by replacing one EPA1 PTS interrupt with a normal interrupt (clear PTSSEL.8). Have the interrupt service routine add T2 + DT to EPA1_TIME and set PTSSEL.8 to re-enable PTS service for EPA1. This adjustment changes the duty cycle without affecting the period.

By using two EPA channels in the PWM remap mode, you can generate duty cycles closer to 0% and 100% than is possible with PWM toggle mode. For further information about generating PWM waveforms with the EPA, see “Operating in Compare Mode” on page 10-12.

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Intel Microcontroller, 80C196NU, 8XC196NP manual EPA and PTS Operations for the PWM Remap Mode Example
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Microcontroller, 80C196NU, 8XC196NP specifications

The Intel 8XC196NP and 80C196NU microcontrollers are part of Intel's renowned 16-bit microcontroller series that gained popularity in the 1980s and 1990s for embedded systems applications. Designed for a variety of applications, these microcontrollers are characterized by their robust performance, versatility, and industry-standard architecture.

The 8XC196NP features an enhanced instruction set with over 100 instructions, allowing for efficient code execution. It operates at clock speeds up to 16 MHz, which contributes to improved performance in time-sensitive applications. The microcontroller is equipped with a 16-bit data bus, enabling more efficient data handling compared to its 8-bit predecessors, thus accommodating complex algorithms and large data sets.

In terms of memory architecture, the 8XC196NP supports an addressable memory space of up to 64 KB of program memory and 64 KB of data memory. This configuration provides sufficient space for large applications while ensuring fast data access. The microcontroller includes integrated features such as timers, serial I/O capabilities, and interrupt processing, which enhance its functionality for real-time applications and control mechanisms.

The 80C196NU, on the other hand, is designed for lower power operation, making it suitable for battery-powered devices. This microcontroller maintains similar features to the 8XC196NP while offering advancements that support low-power consumption. The 80C196NU can also function in a range of temperature environments, making it adaptable for industrial applications.

Both the 8XC196NP and 80C196NU support external memory interfacing, allowing designers to expand the system's capability by connecting additional ROM and RAM. This flexibility makes them appealing for developing complex systems, such as motor controls, industrial automation, and consumer electronics.

Another standout feature of these microcontrollers is their built-in debugging capabilities. Intel provided hardware and software tools that enabled developers to test and troubleshoot their applications effectively, reducing the development time and increasing reliability.

Overall, the Intel 8XC196NP and 80C196NU microcontrollers stand out for their dependability, versatility, and performance, contributing significantly to the evolution of embedded system design. Their legacy continues to influence modern microcontroller technology, ensuring their relevance in a wide array of applications today.