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Intel 8XC251SA, 8XC251SP, 8XC251SQ, 8XC251SB, Embedded Microcontroller Ffffh, Movc, Movx, Ffh, 7FH

Models: Embedded Microcontroller 8XC251SP 8XC251SA 8XC251SQ 8XC251SB

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ADDRESS SPACES

The register file (registers R0–R7) comprises four switchable register banks, each having eight registers. The 32 bytes required for the four banks occupy locations 00H–1FH in the on-chip data memory.

Figure 3-3 shows how the address spaces in the MCS 51 architecture map into the address spaces in the MCS 251 architecture; details are listed in Table 3-1.

The 64-Kbyte code memory for MCS 51 microcontrollers maps into region FF: of the memory space for MCS 251 microcontrollers. Assemblers for MCS 251 microcontrollers assemble code for MCS 51 microcontrollers into region FF:, and data accesses to code memory are directed to this region. The assembler also maps the interrupt vectors to region FF:. This mapping is trans- parent to the user; code executes just as before, without modification.

FFFFH

Code

(MOVC)

0000H

FFFFH

External Data

(MOVX)

R0

Register File

R7

 

 

 

0000H

FFH

FFH

Internal Data

SFRs

(indirect)

(direct)

80H

80H

7FH

 

Internal Data

 

(direct, indirect)

 

00H

 

A4139-01

Figure 3-2. Address Spaces for the MCS® 51 Architecture

3-3

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Intel 8XC251SA, 8XC251SP, 8XC251SQ, 8XC251SB, Embedded Microcontroller manual Ffffh, Movc, Movx, Ffh, 7FH
Page 44 Page 46

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.