8XC196NP, 80C196NU USER’S MANUAL

Figure 11-4 shows the connections between the external crystal and the device. When designing an external oscillator circuit, consider the effects of parasitic board capacitance, extended oper- ating temperatures, and crystal specifications. Consult the manufacturer’s datasheet for perfor- mance specifications and required capacitor values. With high-quality components, 20 pF load capacitors (CL) are usually adequate for frequencies above 1 MHz.

Noise spikes on the XTAL1 or XTAL2 pin can cause a miscount in the internal clock-generating circuitry. Capacitive coupling between the crystal oscillator and traces carrying fast-rising digital signals can introduce noise spikes. To reduce this coupling, mount the crystal oscillator and ca- pacitors near the device and use short, direct traces to connect to XTAL1, XTAL2, and VSS. To further reduce the effects of noise, use grounded guard rings around the oscillator circuitry and ground the metallic crystal case.

C1

XTAL1

8XC196

Device

XTAL2

C2

Quartz Crystal

Note:

Mount the crystal and capacitors close to the device using short, direct traces to XTAL1, XTAL2, and Vss. When using a crystal, C1=C2≈20 pF. When using a ceramic resonator, consult the manufacturer for recommended oscillator circuitry.

A0273-02

Figure 11-4. External Crystal Connections

In cost-sensitive applications, you may choose to use a ceramic resonator instead of a crystal os- cillator. Ceramic resonators may require slightly different load capacitor values and circuit con- figurations. Consult the manufacturer’s datasheet for the requirements.

11-6

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Intel Microcontroller, 80C196NU, 8XC196NP manual External Crystal Connections
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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.
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