INSTRUCTION SET REFERENCE

Operation: ANL

(CY) ← (CY) Λ (bit)

ANL CY,/bit

Binary Mode Source Mode

Bytes:

4

 

 

3

 

 

States:

 

3†

2†

 

 

 

 

 

†If this instruction addresses a port (Px, x = 0–3), add 1 state.

[Encoding]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 0 1 0

 

1 0 0 1

 

 

1 1 1 1

0

y y y

 

 

 

 

 

 

 

 

Hex Code in:

Binary Mode = [A5][Encoding]

 

 

 

 

Source Mode = [Encoding]

 

 

Operation:

ANL

 

 

 

 

 

(CY) ← (CY) Λ Ø (bit)

 

 

 

dir addr

CJNE <dest>,<src>,rel

Function: Compare and jump if not equal.

Description: Compares the magnitudes of the first two operands and branches if their values are not equal. The branch destination is computed by adding the signed relative displacement in the last instruction byte to the PC, after incrementing the PC to the start of the next instruction. If the unsigned integer value of <dest-byte> is less than the unsigned integer value of <src- byte>, the CY flag is set. Neither operand is affected.

The first two operands allow four addressing mode combinations: the accumulator may be compared with any directly addressed byte or immediate data, and any indirect RAM location or working register can be compared with an immediate constant.

Flags:

CY

AC

OV

N

Z

 

 

 

 

 

✓

—

—

✓

✓

 

 

 

 

 

Example: The accumulator contains 34H and R7 contains 56H. After executing the first instruction in the sequence

 

CJNE

R7,#60H,NOT_EQ

 

;

. . .

. . .

;R7 = 60H

NOT_EQ:

JC

REQ_LOW

; IF R7 < 60H

;

. . .

. . .

;R7 > 60H

the CY flag is set and program execution continues at label NOT_EQ. By testing the CY flag, this instruction determines whether R7 is greater or less than 60H.

If the data being presented to Port 1 is also 34H, then executing the instruction,

WAIT: CJNE A,P1,WAIT

clears the CY flag and continues with the next instruction in the sequence, since the accumulator does equal the data read from P1. (If some other value was being input on P1, the program loops at this point until the P1 data changes to 34H.)

A-41

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Intel 8XC251SB, 8XC251SA ANL CY,/bit Binary Mode Source Mode Bytes States, Cjne dest,src,rel, Reqlow, Wait Cjne A,P1,WAIT
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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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