External Memory, Program Memory in Page FFH, Remap

MEMORY PARTITIONS

5.2.1External Memory

Several partitions in pages 00H and FFH and all of pages 01H–0EH are assigned to ext ernal memory (see Table 5-1). Data can be stored in any part of this memory. Instructions can be stored in any part of this memory in 1-Mbyte mode, but can be stored only in page FFH in 64-Kbyte mode. “Memory Configuration Examples” on page 5-27 contains examples of memory configu- rations in the two modes. Chapter 13, “Interfacing with External Memory,” describes the external memory interface and shows additional examples of external memory configurations.

5.2.2Program and Special-purpose Memory

Program memory and special-purpose memory occupy a 4-Kbyte memory partition from FF2000–FF2FFFH. For the 80C196NP and 80C196NU, this partition re sides in external memory (external addresses F2000–F2FFFH). For the 83C 196NP, this partition resides in on-chip ROM in page FFH, and it can also be mapped to page 00H (see “Remapping Internal ROM (83C 196NP Only)” on page 5-22).

5.2.2.1Program Memory in Page FFH

Three partitions in page FFH can be used for program memory:

•FF0100–FF1FFFH in external memory (ext ernal addresses F0100–F1FFFH)

•FF2080–FF2FFFH

—80C196NP and 80C196NU: This partition is in external memory (external addresses F2080–F2FFFH).

—83C196NP: The REMAP bit (CCB1.2), the EA# input, and the type of instruction (extended or nonextended) control access to this partition, as shown in Table 5-2.

Table 5-2. Program Memory Access for the 83C196NP

REMAP	EA# Pin	Instruction Type	Memory Location Accessed
(CCB1.2)	EA# Pin	Instruction Type	Memory Location Accessed
(CCB1.2)

X	Asserted	Extended or nonextended	External memory, F2080–F2FFFH

0	Deasserted	Extended or nonextended	Internal ROM, FF2080–FF2FFFH

1	Deasserted	Extended	Internal ROM, FF2080–FF2FFFH

		Nonextended	External memory, 02080–02FFFH
		Nonextended	External memory, 02080–02FFFH

•FF3000–FFF FFH in external memory (external addresses F3000–FFFFFH)

NOTE

We recommend that you write FFH (the opcode for the RST instruction) to unused program memory locations. This causes a device reset if a program unintentionally begins to execute in unused memory.

5-5

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.

Intel 80C196NU External Memory, Program and Special-purpose Memory, Program Memory in Page FFH

Models: Microcontroller 80C196NU 8XC196NP