8XC196NP, 80C196NU USER’S MANUAL

The simplest way to reset the device is to insert a capacitor between the RESET# pin and VSS, as

shown in Figure 11-9. The device has an internal pull-up resistor (RRST) shown in Figure 11-8. RESET# should remain asserted for at least one state time after VCC and XTAL1 have stabilized

and met the operating conditions specified in the datasheet. A capacitor of 4.7 µF or greater should provide sufficient reset time, as long as VCC rises quickly.

+

4.7μF

RESET#

8XC196 Device

A0276-01

Figure 11-9. Minimum Reset Circuit

Other devices in the system may not be reset because the capacitor will keep the voltage above VIL. Since RESET# is asserted for only 16 state times, it may be necessary to lengthen and buffer the system-reset pulse. Figure 11-10 shows an example of a system-reset circuit. In this example, D2 creates a wired-OR gate connection to the reset pin. An internal reset, system power-up, or SW1 closing will generate the system-reset signal.

 

VCC

 

(1)

 

VCC

 

(2)

D1

R

D2

 

 

4.7 kΩ

RESET#

SW1C

Notes:

Schmitt Triggers

System reset signal to external circuitry

8XC196

Device

1.D1 provides a faster cycle time for repetitive power-on resets.

2.Optional pull-up for faster recovery.

A0277-02

Figure 11-10. Example System Reset Circuit

11-10

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Intel 80C196NU, 8XC196NP, Microcontroller manual Minimum Reset Circuit
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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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