MEMORY PARTITIONS

Data accesses to 002000–002FFFH depend on the REMAP bit and the EA# input:

•If remapping is disabled (CCB1.2 = 0), accesses are external.

•If remapping is enabled (CCB1.2 = 1), accesses depend on EA#:

—If EA# is low, accesses are external (REMAP is ignored).

—If EA# is high, accesses are to the internal ROM.

5.6MEMORY CONFIGURATION EXAMPLES

This section provides examples of memory configurations for both 64-Kbyte and 1-Mbyte mode. Each example consists of a circuit diagram and a memory map that describes how the address space is implemented. Chapter 13, “Interfacing with External Me mory,” discus ses the interface in detail and provides additional examples.

5.6.1Example 1: Using the 64-Kbyte Mode

Figure 5-9 shows a system designed for operation in the 64-Kbyte mode. Code executes only from page FFH, which is implemented by the 64-Kbyte flash memory. The 32-Kbyte RAM in the upper half of page 00H stores near data. Table 5-12 on page 5-28 lists the memory addresses for this example. (For memory map details, see Table 5-1 on page 5-4.)

CS1#

CS0#

A15:0

8XC196NP, NU

AD7:0

RD#

WR#

A15:0

AD7:0

CE#

Page FFH

A15:0

Flash

64Kx8

Code & Data

FF0000–

FFFFFFH

D7:0

OE# WE#

A14:0

AD7:0

CE#

Page 00H

A14:0

RAM

32Kx8

Data

008000–

00FFFFH

D7:0

OE# WE#

A2474-02

Figure 5-9. A 64-Kbyte System With an 8-bit Bus

80C196NP and 80C196NU: The flash memory, which implements page FFH, holds the special- purpose memory (FF2000–FF207FH), code, and far constants.

5-27

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Intel 8XC196NP, 80C196NU manual Memory Configuration Examples, Example 1 Using the 64-Kbyte Mode, Rd# Wr#, Ce#, Oe# We#
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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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