INSTRUCTION SET REFERENCE

 

 

 

Table A-6. Instruction Set (Continued)

 

 

 

 

 

 

 

 

 

 

Mnemonic

 

 

 

Operation

 

 

 

Instruction Format

 

 

 

 

PUSHA

PUSH ALL. This instruction is used instead of

 

 

PUSHF, to support the eight additional

PUSHA

 

interrupts. It pushes two words —

 

 

 

 

 

(11110100)

 

PSW/INT_MASK and INT_MASK1/WSR —

 

 

 

onto the stack.

 

 

 

 

 

 

 

 

This instruction clears the PSW, INT_MASK,

 

 

and INT_MASK1 registers and decrements

 

 

the SP by 4. Interrupt calls cannot occur

 

 

immediately following this instruction.

 

 

SP ← SP – 2

 

 

 

 

 

 

 

 

(SP) ← PSW/INT_MASK

 

 

 

 

 

PSW/INT_MASK ←

0

 

 

 

 

 

 

SP ← SP – 2

 

 

 

 

 

 

 

 

(SP) ← INT_MASK1/WSR

 

 

 

 

 

INT_MASK1 ← 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PSW Flag Settings

 

 

 

 

 

Z

N

C

 

V

VT

ST

 

 

 

 

0

0

0

 

0

0

0

 

 

 

 

 

PUSHF

PUSH FLAGS. Pushes the PSW onto the top

 

 

of the stack, then clears it. Clearing the PSW

PUSHF

 

disables interrupt servicing. Interrupt calls

 

(11110010)

 

cannot occur immediately following this

 

 

 

instruction.

 

 

 

 

 

 

 

 

 

SP ← SP – 2

 

 

 

 

 

 

 

 

(SP) ← PSW/INT_MASK

 

 

 

 

 

PSW/INT_MASK ←

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PSW Flag Settings

 

 

 

 

 

Z

N

C

 

V

VT

ST

 

 

 

 

0

0

0

 

0

0

0

 

 

 

 

 

RET

RETURN FROM SUBROUTINE. Pops the

 

 

PC off the top of the stack.

 

 

 

RET

 

64-Kbyte mode:

1-Mbyte mode:

 

(11110000)

 

PC ← (SP)

 

PC ← (SP)

 

 

 

 

 

 

 

 

SP ← SP + 2

SP ← SP + 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PSW Flag Settings

 

 

 

 

 

Z

N

C

 

V

VT

ST

 

 

 

 

—

—

—

—

—

—

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A-35

Page 339 Page 341
Page 340
Image 340
Intel 8XC196NP, 80C196NU, Microcontroller manual Sp ← Psw/Intmask Psw/Intmask ←, SP ← INTMASK1/WSR INTMASK1 ←
Page 339 Page 341

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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