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Intel 80C196NU, 8XC196NP, Microcontroller manual 13.5.2 16-bit Bus Timings, Cs#

Models: Microcontroller 80C196NU 8XC196NP

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8XC196NP, 80C196NU USER’S MANUAL

CS1#

CS0#

8XC196

A19:0

AD15:0

RD#

WR#

A18:1

AD15:0

CS#

Flash

256K×￿16

A17:0

D15:0

OE# WE#

A18:1

AD15:0

CS#

Flash

256K×￿16

A17:0

D15:0

OE# WE#

A2438-03

Figure 13-10. 16-bit External Devices in Demultiplexed Mode

13.5.2 16-bit Bus Timings

Figure 13-11 shows idealized 16-bit external-bus timings for the 8XC196NP. The signals are di- vided into two groups: signals for a demultiplexed bus (top) and signals for a multiplexed bus (bottom). Several bus signals are omitted from the figure to focus on a comparison of multiplexed and demultiplexed buses. The timing parameters are addressed in “Comparison of Multiplexed and Demultiplexed Buses” on page 13-26. Comprehensive timing specifications for both the 8XC196NP and the 80C196NU are shown in Figures 13-20 through 13-23.

CLKOUT and ALE are the same in multiplexed and demultiplexed buses. The CLKOUT period is twice the internal oscillator period (2t). The bus cycles shown here, which have no wait states, require two CLKOUT periods (two state times).

The rising edge of the address latch enable (ALE) indicates that the device is driving an address onto the bus (A19:16 and AD15:0). The device presents a valid address before ALE falls. In a multiplexed system, the ALE signal is used to strobe a transparent latch (such as a 74AC373), which captures the address from AD15:0 and holds it while the bus controller puts data onto AD15:0.

13-22

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Intel 80C196NU, 8XC196NP, Microcontroller manual 13.5.2 16-bit Bus Timings, Cs#
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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.