REGISTERS

 

 

EP_REG

 

 

 

EP_REG

Address:

1FE5H

 

Reset State:

X0H

Each bit of the extended port data output (EP_REG) register contains data to be driven out by the corresponding pin. When a pin is configured as standard I/O (EP_MODE.x = 0), the result of a CPU write to EP_REG is immediately visible on the pin.

During nonextended data accesses, EP_REG contains the value of the memory page that is to be accessed. For compatibility with software tools, clear the EP_REG bit for any EPORT pin that is configured as an extended-address signal (EP_MODE.x set).

80C196NU Only: For nonextended data accesses, the 80C196NU forces the page address to 00H. You cannot change pages by modifying EP_REG.

7

—

—

—

—

 

 

 

 

0

PIN3

PIN2

PIN1

PIN0

 

 

 

 

Bit

Bit

Function

Number

Mnemonic

 

 

 

 

7:4

—

Reserved; always write as zeros.

 

 

 

3:0

PIN3:0

Extended Address Port Pin x Output

 

 

If EPORT.x is to be used as an output, write the data that it is to drive

 

 

out.

 

 

If EPORT.x is to be used as an input, set this bit.

 

 

For the 8XC196NP, if EPORT.x is to be used as an address line, write

 

 

the correct value for the memory page to be accessed by nonextended

 

 

instructions.

 

 

The 80C196NU forces the page address to 00H. You cannot change

 

 

pages by modifying EP_REG

 

 

 

C-17

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Intel 80C196NU, 8XC196NP, Microcontroller manual Epreg, X0H
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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.
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