8XC251SA, SB, SP, SQ USER’S MANUAL

Bytes:

States:

[Encoding]

Hex Code in:

Operation:

Binary Mode Source Mode

1

2

4

5

 

 

1 1 0 1

0 1 1 i

 

 

Binary Mode = [Encoding]

Source Mode = [Encoding]

XCHD

(A).3:0 → ← ((Ri)).3:0

XRL <dest>,<src>

Function: Logical Exclusive-OR for byte variables

Description: Performs the bitwise logical Exclusive-OR operation (∀) between the specified variables, storing the results in the destination. The destination operand can be the accumulator, a register, or a direct address.

The two operands allow 12 addressing mode combinations. When the destination is the accumulator or a register, the source addressing can be register, direct, register-indirect, or immediate; when the destination is a direct address, the source can be the accumulator or immediate data.

(Note: When this instruction is used to modify an output port, the value used as the original port data is read from the output data latch, not the input pins.)

Flags:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CY

 

AC

 

OV

N

 

Z

 

 

 

 

 

 

 

 

 

 

 

—

 

—

 

—

✓

 

✓

Example:

 

 

 

 

 

 

The accumulator contains 0C3H (11000011B) and R0 contains 0AAH (10101010B). After

 

executing the instruction

 

 

 

 

 

 

 

 

XRL A,R0

 

 

 

 

 

 

 

 

 

the accumulator contains 69H (01101001B).

 

 

 

 

 

 

When the destination is a directly addressed byte, this instruction can complement combina-

 

tions of bits in any RAM location or hardware register. The pattern of bits to be comple-

 

mented is then determined by a mask byte, either a constant contained in the instruction or

 

a variable computed in the accumulator at run time. The instruction

 

 

 

 

XRL P1,#00110001B

 

 

 

 

 

 

 

 

Variations

complements bits 5, 4, and 0 of output Port 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XRL dir8,A

 

 

 

 

 

 

 

 

 

 

 

Binary Mode

Source Mode

 

 

 

 

 

Bytes:

2

 

 

2

 

 

 

 

 

 

States:

2†

 

2†

 

 

 

 

 

 

†If this instruction addresses a port (Px, x = 0–3), add 2 states.

 

 

 

A-132

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Intel Embedded Microcontroller, 8XC251SA, 8XC251SP, 8XC251SQ manual XRL A,R0, XRL dir8,A Binary Mode Source Mode Bytes States
Page 383 Page 385

Embedded Microcontroller, 8XC251SP, 8XC251SA, 8XC251SQ, 8XC251SB specifications

The Intel 8XC251 series of embedded microcontrollers is a family of versatile and powerful devices, designed to meet the demands of a wide range of applications. With models such as the 8XC251SB, 8XC251SQ, 8XC251SA, and 8XC251SP, this series offers unique features while maintaining a high level of performance and reliability.

At the heart of the 8XC251 microcontrollers is the 8051 architecture, which provides a 16-bit processor capable of executing complex instructions efficiently. This architecture not only allows for a rich instruction set but also facilitates programming in assembly language and higher-level languages like C, which are essential for developing sophisticated embedded systems.

One of the significant features of the 8XC251 family is its integrated peripherals, including timer/counters, serial communication interfaces, and interrupt systems. These peripherals enable developers to implement timing functions, data communication, and real-time processing, all of which are crucial in modern embedded applications. The 8XC251SB and 8XC251SQ models, for instance, come equipped with multiple I/O ports that allow for interfacing with other devices and systems, enhancing their functionality in various environments.

The memory architecture of the 8XC251 devices is noteworthy, featuring on-chip ROM, RAM, and EEPROM. The on-chip memory allows for fast access times, which is essential for executing programs efficiently. Moreover, the EEPROM serves as non-volatile memory, enabling the storage of configuration settings and important data that must be retained even when power is lost.

In terms of operating voltage, the 8XC251 devices are designed to operate in a wide range, typically between 4.0V and 6.0V. This flexibility makes them suitable for battery-powered applications, where energy efficiency is critical. The power management features, including reduced power modes, further enhance their suitability for portable devices.

Lastly, the 8XC251 series is supported by a wide range of development tools and resources, allowing engineers and developers to streamline the development process. This support, combined with the microcontrollers' robust features, makes the Intel 8XC251 family a reliable choice for various embedded applications, such as industrial automation, automotive systems, and consumer electronics.

Overall, the Intel 8XC251SB, 8XC251SQ, 8XC251SA, and 8XC251SP deliver high performance, versatility, and ease of use, making them a preferred choice for embedded system designers looking to develop efficient and effective solutions.
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