Chapter Interfacing with External Memory | Intel 8XC196NP, 80C196NU

			CONTENTS
12.3	IDLE MODE			12-5
12.4	STANDBY MODE (80C196NU ONLY)			12-6
12.4.1 Enabling and Disabling Standby Mode				12-6
12.4.2		Entering Standby Mode		12-6
12.4.3		Exiting Standby Mode		12-7
12.5	POWERDOWN MODE			12-7
12.5.1 Enabling and Disabling Powerdown Mode				12-7
12.5.2		Entering Powerdown Mode		12-7
12.5.3		Exiting Powerdown Mode		12-8
12.5.3.1			Generating a Hardware Reset	12-8
12.5.3.2 Asserting an External Interrupt Signal				12-8
12.5.3.3			Selecting C1	12-10
12.6	ONCE MODE			12-12
12.7	RESERVED TEST MODES (80C196NU ONLY)			12-12
CHAPTER 13
INTERFACING WITH EXTERNAL MEMORY
13.1	INTERNAL AND EXTERNAL ADDRESSES			13-1
13.2	EXTERNAL MEMORY INTERFACE SIGNALS			13-2
13.3	THE CHIP-SELECT UNIT			13-5
13.3.1 Defining Chip-select Address Ranges				13-7
13.3.2 Controlling Wait States, Bus Width, and Bus Multiplexing				13-10
13.3.3		Chip-select Unit Initial Conditions		13-11
13.3.4		Initializing the Chip-select Registers		13-11
13.3.5 Example of a Chip-select Setup				13-12
13.4	CHIP CONFIGURATION REGISTERS AND CHIP CONFIGURATION BYTES			13-14
13.5	BUS WIDTH AND MULTIPLEXING			13-18
13.5.1		A 16-bit Example System		13-21
13.5.2		16-bit Bus Timings		13-22
13.5.3		8-bit Bus Timings		13-24
13.5.4 Comparison of Multiplexed and Demultiplexed Buses				13-26
13.6	WAIT STATES (READY CONTROL)			13-26
13.7	BUS-HOLD PROTOCOL			13-30
13.7.1		Enabling the Bus-hold Protocol		13-32
13.7.2		Disabling the Bus-hold Protocol		13-32
13.7.3		Hold Latency		13-32
13.7.4		Regaining Bus Control		13-33
13.8	WRITE-CONTROL MODES			13-33
13.9	SYSTEM BUS AC TIMING SPECIFICATIONS			13-36
13.9.1 Deferred Bus-cycle Mode (80C196NU Only)				13-40
13.9.2		Explanation of AC Symbols		13-42
13.9.3		AC Timing Definitions		13-42

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 8XC196NP, 80C196NU, Microcontroller manual Chapter Interfacing with External Memory

Models: Microcontroller 80C196NU 8XC196NP

CONTENTS

STANDBY MODE (80C196NU ONLY)

POWERDOWN MODE

CHAPTER 13

INTERFACING WITH EXTERNAL MEMORY

THE CHIP-SELECT UNIT

BUS WIDTH AND MULTIPLEXING

BUS-HOLD PROTOCOL

SYSTEM BUS AC TIMING SPECIFICATIONS

Microcontroller, 80C196NU, 8XC196NP specifications