8XC196NP, 80C196NU USER’S MANUAL

Figure 13-19 illustrates the use of the write strobe mode in a mixed 8-bit and 16-bit system with two flash memories and one SRAM. The WRL# signal, which is generated for all 8-bit writes (Table 13-14), is used to write bytes to the SRAM. Note that the RD# signal is sufficient for sin- gle-byte reads on a 16-bit bus. Both bytes are put onto the data bus and the memory controller discards the unwanted byte.

CS1#

CS0#

A19:0

AD15:8

8XC196

AD7:0

RD#

WRH#

WRL#

A18:1

AD15:8

CE#

A17:0

D7:0

Flash

256K×￿8

High

WE# OE#

A18:1

AD7:0

CE#

A17:0

Flash

256K×￿8

Low

D7:0

WE# OE#

A12:0

AD7:0

CE#

A12:0

SRAM

8K×￿8

D7:0

WE# OE#

A2439-03

Figure 13-19. A System with 8-bit and 16-bit Buses

13.9 SYSTEM BUS AC TIMING SPECIFICATIONS

Refer to the latest datasheet for the AC timings to make sure your system meets specifications. The major external bus timing specifications are shown in Figure 13-20 through 13-23.

13-36

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Intel Microcontroller, 80C196NU, 8XC196NP manual System BUS AC Timing Specifications, Rd# Wrh# Wrl#, We# Oe#
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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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