8XC196NP, 80C196NU USER’S MANUAL

After RESET# is deasserted, the following pins are initialized:

•The P2.7/CLKOUT pin operates as CLKOUT (as during reset). Be sure that the CLKOUT signal does not damage external hardware.

•The P3.0/CS0# pin operates as CS0#, which is asserted for the CCB fetches. If you plan to use the P3.0 pin as an input, it must be reconfigured from its post-reset operation as an output.

•The BHE#/WRH# pin operates as BHE#.

•The WR#/WRL# pin operates as WR#.

•Bus-hold function is disabled internally (WSR.7 = 0).

•The READY/P5.6 pin is active (that is, the chip responds to external requests for additional wait states).

•The INST pin is low (deasserted).

•The AD15:0 pins are active.

•The following port pins are weakly held high: P1.7:0, P2.6, P2.4:0, P3.7:1, and P4.7:0.

•The EPORT.3:0 pins are forced high, regardless of the state of the EA# pin.

Following reset, you should set the stack pointer and initialize the chip-select outputs using the procedure in “Example of a Chip-select Setup” on page 13-12.

13.5 BUS WIDTH AND MULTIPLEXING

The external bus can operate with a 16-bit or 8-bit data bus and with a multiplexed or demulti- plexed address/data bus. Figure 13-8 shows the external bus signals during operation in the four combinations of bus width and multiplexing.

13-18

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Intel Microcontroller, 80C196NU, 8XC196NP manual BUS Width and Multiplexing
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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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