8XC196NP, 80C196NU USER’S MANUAL

 

 

Table B-3. Signal Descriptions (Continued)

Name

Type

Description

 

 

 

VCC

PWR

Digital Supply Voltage

 

 

Connect each VCC pin to the digital supply voltage.

VSS

GND

Digital Circuit Ground

 

 

Connect each VSS pin to ground through the lowest possible impedance path.

WR#

O

Write

 

 

This active-low output indicates that an external write is occurring. This signal is

 

 

asserted only during external memory writes.

 

 

WR# is multiplexed with WRL#.

 

 

The chip configuration register 0 (CCR0) determines whether this pin

 

 

functions as WR# or WRL#. CCR0.2 = 1 selects WR#; CCR0.2 = 0 selects

 

 

WRL#.

WRH#

O

Write High

 

 

During 16-bit bus cycles, this active-low output signal is asserted for high-byte

 

 

writes and word writes to external memory. During 8-bit bus cycles, WRH# is

 

 

asserted for all write operations.

 

 

WRH# is multiplexed with BHE#.

 

 

The chip configuration register 0 (CCR0) determines whether this pin

 

 

functions as BHE# or WRH#. CCR0.2 = 1 selects BHE#; CCR0.2 = 0 selects

 

 

WRH#.

WRL#

O

Write Low

 

 

During 16-bit bus cycles, this active-low output signal is asserted for low-byte

 

 

writes and word writes. During 8-bit bus cycles, WRL# is asserted for all write

 

 

operations.

 

 

WRL# is multiplexed with WR#.

 

 

The chip configuration register 0 (CCR0) determines whether this pin

 

 

functions as WR# or WRL#. CCR0.2 = 1 selects WR#; CCR0.2 = 0 selects

 

 

WRL#.

XTAL1

I

Input Crystal/Resonator or External Clock Input

 

 

Input to the on-chip oscillator, internal phase-locked loop circuitry (80C196NU),

 

 

and the internal clock generators. The internal clock generators provide the

 

 

peripheral clocks, CPU clock, and CLKOUT signal. When using an external

 

 

clock source instead of the on-chip oscillator, connect the clock input to XTAL1.

 

 

The external clock signal must meet the VIH specification for XTAL1 (see

 

 

datasheet).

XTAL2

O

Inverted Output for the Crystal/Resonator

 

 

Output of the on-chip oscillator inverter. Leave XTAL2 floating when the design

 

 

uses a external clock source instead of the on-chip oscillator.

B-12

Page 387
Image 387
Intel 80C196NU, 8XC196NP, Microcontroller manual Asserted only during external memory writes

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.