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Intel Microcontroller manual 8XC196NP, 80C196NU USER’S Manual

Models: Microcontroller 80C196NU 8XC196NP

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8XC196NP, 80C196NU USER’S MANUAL

In special-function mode (selected by setting Px_MODE.y), SFDIR and SFDATA are input to the multiplexers. These signals combine to drive the gates of Q1 and Q2 so that the output is high, low, or high impedance. Special-function output signals clear SFDIR; special-function input sig- nals set SFDIR. Table 7-5 is a logic table for special-function operation of these ports. Even if a pin is to be used in special-function mode, you must still initialize the pin as an input or output by writing to Px_DIR.

Resistor R1 provides ESD protection for the pin. Input signals are buffered. The ports use Schmitt-triggered buffers for improved noise immunity. The signals are latched into the Px_PIN sample latch and output onto the internal bus when the Px_PIN register is read.

The falling edge of RESET# turns on transistor Q3, which remains on for about 300 ns, causing the pin to change rapidly to its reset state. The active-low level of RESET# turns on transistor Q4, which weakly holds the pin high. (Q4 can source approximately –10 μA; consult the datasheet for exact specifications.) Q4 remains on, weakly holding the pin high, until your software writes to the Px_MODE register.

NOTE

P2.7 is an exception. After reset, P2.7 carries the CLKOUT signal rather than being held high. When CLKOUT is selected, it is always a complementary output.

7-4

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Page 149
Image 149
Intel Microcontroller manual 8XC196NP, 80C196NU USER’S Manual
Page 148 Page 150

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.