Flow Diagram for PTS and Standard Interrupts

8XC196NP, 80C196NU USER’S MANUAL

Interrupt Pending or PTSSRV Bit Set

NMI	Yes
Pending
?
No
INT_MASK.x	No	Return
INT_MASK.x		Return
= 1?
Yes
PTS	No	Interrupts	No
Enabled?		Interrupts	Return
Enabled?		Enabled	Return
		Enabled
		?
Yes		Yes
Yes
PTSSEL.x	No
PTSSEL.x
Bit = 1?		Priority
		Priority
Yes		Encoder
Yes		Highest Priority Interrupt
Priority		Highest Priority Interrupt
Priority
Encoder

Highest Priority PTS Interrupt

Reset INT_PEND.x

Bit

Execute 1 PTS Cycle

(Microcoded)

Decrement

PTSCOUNT

Return PTSCOUNT

= 0?

Yes

Clear PTSSEL.x Bit

Yes PTSSRV.x No = 1?

Reset PTSSRV.x				Reset INT_PEND.x
Bit				Bit

PUSH PC

on Stack

LJMP to

ISR

Execute Interrupt

Service Routine

POP PC

from Stack

Set PTSSRV.x Bit

Return

A0320-02

Figure 6-1. Flow Diagram for PTS and Standard Interrupts

6-2

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 Flow Diagram for PTS and Standard Interrupts

Models: Microcontroller 80C196NU 8XC196NP

8XC196NP, 80C196NU USER’S MANUAL

PTS

PTSCOUNT

Figure 6-1. Flow Diagram for PTS and Standard Interrupts

Microcontroller, 80C196NU, 8XC196NP specifications