REGISTERS

 

 

ACC_STAT

 

 

Table C-4. Effect of SME and FME Bit Combinations

 

 

 

SME

FME

Description

 

 

 

0

0

Sets the OVF and STOVF flags if the sign bits of the accumulator and the addend (the

 

 

number to be added to the contents of the accumulator) are equal, but the sign bit of the

 

 

result is the opposite.

 

 

 

0

1

Shifts the addend (the number to be added to the contents of the accumulator) left by one

 

 

bit before adding it to the accumulator. Sets the OVF and STOVF flags if the sign bits of the

 

 

accumulator and the addend are equal, but the sign bit of the result is the opposite.

 

 

 

1

0

Accumulates a signed integer value up or down to saturation and sets the STSAT flag.

 

 

Positive saturation changes the accumulator value to 7FFFFFFFH; negative saturation

 

 

changes the accumulator value to 80000000H. Accumulation proceeds normally after

 

 

saturation, which means that the accumulator value can increase from a negative saturation

 

 

or decrease from a positive saturation.

 

 

 

1

1

Shifts the addend (the number to be added to the contents of the accumulator) left by one

 

 

bit before adding it to the accumulator. Accumulates a signed integer value up or down to

 

 

saturation and sets the STSAT flag. Positive saturation changes the accumulator value to

 

 

7FFFFFFFH; negative saturation changes the accumulator value to 80000000H. Accumu-

 

 

lation proceeds normally after saturation, which means that the accumulator value can

 

 

increase from a negative saturation or decrease from a positive saturation.

 

 

 

C-7

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Intel Microcontroller, 80C196NU, 8XC196NP manual Table C-4. Effect of SME and FME Bit Combinations, Sme Fme

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.