8XC251SA, SB, SP, SQ USER’S MANUAL

Memory Address Space

16 Mbytes

FFFFH

MCS® 51 Architecture

Code Memory

FF:0000H 0000H

02:0000H

FFFFH

MCS 51 Architecture

External Data Memory

01:0000H 0000H

 

 

MCS 51 Architecture FFH

00:0000H

00H

Internal Data Memory

 

SFR Space

512 Bytes

S:1FFH

S:100H

FFH

MCS 51 Architecture

80H SFRs

S:07FH

S:000H

Register File

64 Bytes

63

8

0 0 MCS 51 Architecture R. F. 7

A4133-01

Figure 3-3. Address Space Mappings MCS® 51 Architecture to MCS® 251 Architecture

Table 3-1. Address Mappings

 

 

MCS® 51 Architecture

MCS® 251 Architecture

Memory Type

Size

 

Location

Data

Location

 

 

 

 

Addressing

 

 

 

 

 

 

 

 

 

 

 

Code

64 Kbytes

 

0000H–FFFFH

Indirect using

FF:0000H–FF:FFFFH

 

MOVC instr.

 

 

 

 

 

 

 

 

 

 

 

External Data

64 Kbytes

 

0000H–FFFFH

Indirect using

01:0000H–01:FFFFH

 

MOVX instr.

 

 

 

 

 

 

 

 

 

 

 

Internal Data

128 bytes

 

00H–7FH

Direct, Indirect

00:0000H–00:007FH

 

 

 

 

 

128 bytes

 

80H–FFH

Indirect

00:0080H–00:00FFH

 

 

 

 

 

 

 

 

SFRs

128 bytes

 

S:80H–S:FFH

Direct

S:080H–S:0FFH

 

 

 

 

 

 

Register File

8 bytes

 

R0–R7

Register

R0–R7

 

 

 

 

 

 

3-4

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Intel 8XC251SP, 8XC251SA, 8XC251SQ, 8XC251SB, Embedded Microcontroller manual S1FFH, FF0000H-FFFFFFH
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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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