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Intel 8XC251SB, 8XC251SA, 8XC251SP Address Spaces for MCS 251 Microcontrollers, Ffffffh, S1FFH

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

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CHAPTER 3

ADDRESS SPACES

MCS® 251 microcontrollers have three address spaces: a memory space, a special function reg- ister (SFR) space, and a register file. This chapter describes these address spaces as they apply to all MCS 251 microcontrollers and to the 8XC251Sx in particular. It also discusses the compati- bility of the MCS 251 architecture and the MCS® 51 architecture in terms of their address spaces.

3.1ADDRESS SPACES FOR MCS® 251 MICROCONTROLLERS

Figure 3-1 shows the memory space, the SFR space, and the register file for MCS 251 microcon- trollers. (The address spaces are depicted as being eight bytes wide with addresses increasing from left to right and from bottom to top.)

Memory Address Space

16 Mbytes

FF:FFFFH

00:0000H00:0007H

SFR Space

512 Bytes

S:1FFH

S:000HS:007H

 

Register File

 

64 Bytes

 

 

 

63

0

7

A4100-01

Figure 3-1. Address Spaces for MCS® 251 Microcontrollers

3-1

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Intel 8XC251SB, 8XC251SA, 8XC251SP, 8XC251SQ manual Address Spaces for MCS 251 Microcontrollers, Ffffffh, S1FFH
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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.