8XC251SA, SB, SP, SQ USER’S MANUAL

Table A-8. Data Instructions

Instruction

Oper Rmd,Rms

Oper WRjd,WRjs

Oper DRkd,DRks

Oper Rm,#data

Oper WRj,#data16

Oper DRk,#data16

MOV DRk(h),#data16

MOV DRk,#1data16

CMP DRk,#1data16

Oper Rm,dir8

Oper WRj,dir8

Oper DRk,dir8

Oper Rm,dir16

Oper WRj,dir16

Oper DRk,dir16 (1)

Oper Rm,@WRj

Oper Rm,@DRk

Byte 0

x

C

 

 

x

D

 

 

x

F

 

 

x

E

 

 

x

E

 

 

x

E

 

 

7

A

7

E

B

E

 

 

x

E

 

 

x

E

 

 

x

E

 

 

x

E

 

 

x

E

 

 

x

E

 

 

x

E

 

 

x

E

 

 

Byte 1

md ms

jd/2 js/2

kd/4 ks/4

m0000

j/2 0100 k/4 1000

k/4 1100

m0001

j/2 0101

k/4 1101

m 0011

j/2 0111

k/4 1111

j/2 1001

k/4 1011

Byte 2

#data

#data (high)

#data (high)

#data (high)

dir8 addr

dir8 addr

dir8 addr

dir16 addr (high)

dir16 addr (high)

dir16 addr (high)

m00

m 00

Byte 3

#data (low) #data (low) #data (low)

dir16 addr (low) dir16 addr (low) dir16 addr (low)

NOTE:

1.For this instruction, the only valid operation is MOV.

Table A-9. High Nibble, Byte 0 of Data Instructions

x

 

Operation

Notes

 

 

 

 

2

 

ADD reg,op2

 

 

 

 

 

9

 

SUB reg,op2

 

 

 

 

 

B

 

CMP reg,op2 (1)

 

 

 

 

All addressing modes are

4

 

ORL reg,op2 (2)

 

supported.

 

 

 

5

 

ANL reg,op2 (2)

 

 

 

 

 

6

 

XRL reg,op2 (2)

 

 

 

 

 

7

 

MOV reg,op2

 

 

 

 

 

8

 

DIV reg,op2

Two modes only:

 

 

 

reg,op2 = Rmd,Rms

A

 

MUL reg,op2

 

reg,op2 = Wjd,Wjs

 

 

 

 

 

 

NOTES:

 

1.

The CMP operation does not support DRk, direct16.

2.

For the ORL, ANL, and XRL operations, neither reg nor op2

 

can be DRk.

 

 

 

 

 

A-6

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Intel 8XC251SB, 8XC251SA manual Table A-8. Data Instructions, Table A-9. High Nibble, Byte 0 of Data Instructions, Operation
Page 257 Page 259

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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