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Intel 8XC251SQ, 8XC251SA, 8XC251SP, 8XC251SB, Embedded Microcontroller manual Figures

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

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8XC251SA, SB, SP, SQ USER’S MANUAL

FIGURES

Figure

 

Page

2-1

Functional Block Diagram of the 8XC251SA, SB, SP, SQ

2-2

2-2

The CPU

2-5

2-3

Clocking Definitions

2-6

3-1

Address Spaces for MCS® 251 Microcontrollers

3-1

3-2

Address Spaces for the MCS® 51 Architecture

3-3

3-3

Address Space Mappings MCS® 51 Architecture to MCS® 251 Architecture

3-4

3-4

8XC251SA, SB, SP, SQ Address Space

3-6

3-5

Hardware Implementation of the 8XC251SA, SB, SP, SQ Address Space

3-7

3-6

The Register File

3-11

3-7

Register File Locations 0–7

3-12

3-8

Dedicated Registers in the Register File and their Corresponding SFRs

3-14

4-1

Configuration Array (On-chip)

4-2

4-2

Configuration Array (External)

4-3

4-3

Configuration Byte UCONFIG0

4-6

4-4

Configuration Byte UCONFIG1

4-7

4-5

Internal/External Address Mapping (RD1:0 = 00 and 01)

4-10

4-6

Internal/External Address Mapping (RD1:0 = 10 and 11)

4-11

4-7

Binary Mode Opcode Map

4-15

4-8

Source Mode Opcode Map

4-15

5-1

Word and Double-word Storage in Big Endien Form

5-3

5-2

Program Status Word Register

5-18

5-3

Program Status Word 1 Register

5-19

6-1

Interrupt Control System

6-2

6-2

Interrupt Enable Register

6-6

6-3

Interrupt Priority High Register

6-8

6-4

Interrupt Priority Low Register

6-8

6-5

The Interrupt Process

6-9

6-6

Response Time Example #1

6-11

6-7

Response Time Example #2

6-12

7-1

Port 1 and Port 3 Structure

7-3

7-2

Port 0 Structure

7-3

7-3

Port 2 Structure

7-4

7-4

Internal Pullup Configurations

7-7

8-1

Basic Logic of the Timer/Counters

8-2

8-2

Timer 0/1 in Mode 0 and Mode 1

8-4

8-3

Timer 0/1 in Mode 2, Auto-Reload

8-5

8-4

Timer 0 in Mode 3, Two 8-bit Timers

8-6

8-5

TMOD: Timer/Counter Mode Control Register

8-7

8-6

TCON: Timer/Counter Control Register

8-8

8-7

Timer 2: Capture Mode

8-11

8-8

Timer 2: Auto Reload Mode (DCEN = 0)

8-12

8-9

Timer 2: Auto Reload Mode (DCEN = 1)

8-13

8-10

Timer 2: Clock Out Mode

8-15

8-11

T2MOD: Timer 2 Mode Control Register

8-16

x

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Intel 8XC251SQ, 8XC251SA, 8XC251SP, 8XC251SB, Embedded Microcontroller manual Figures
Page 11 Page 13

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.