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Intel 8XC251SB, 8XC251SA, 8XC251SP, 8XC251SQ, Embedded Microcontroller manual 10-1

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

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CONTENTS

 

FIGURES

 

Figure

 

Page

8-12

T2CON: Timer 2 Control Register

8-17

9-1

Programmable Counter Array

9-3

9-2

PCA 16-bit Capture Mode

9-6

9-3

PCA Software Timer and High-speed Output Modes

9-8

9-4

PCA Watchdog Timer Mode

9-10

9-5

PCA 8-bit PWM Mode

9-11

9-6

PWM Variable Duty Cycle

9-12

9-7

CMOD: PCA Timer/Counter Mode Register

9-13

9-8

CCON: PCA Timer/Counter Control Register

9-14

9-9

CCAPMx: PCA Compare/Capture Module Mode Registers

9-15

10-1

Serial Port Block Diagram

10-2

10-2

SCON: Serial Port Control Register

10-3

10-3

Mode 0 Timing

10-5

10-4

Data Frame (Modes 1, 2, and 3)

10-6

10-5

Timer 2 in Baud Rate Generator Mode

10-13

11-1

Minimum Setup

11-1

11-2

CHMOS On-chip Oscillator

11-3

11-3

External Clock Connection

11-4

11-4

External Clock Drive Waveforms

11-5

11-5

Reset Timing Sequence

11-8

12-1

Power Control (PCON) Register

12-2

12-2

Idle and Powerdown Clock Control

12-3

13-1

Bus Structure in Nonpage Mode and Page Mode

13-1

13-2

External Code Fetch (Nonpage Mode)

13-4

13-3

External Data Read (Nonpage Mode)

13-4

13-4

External Data Write (Nonpage Mode)

13-5

13-5

External Code Fetch (Page Mode)

13-6

13-6

External Data Read (Page Mode)

13-7

13-7

External Data Write (Page Mode)

13-7

13-8

External Code Fetch (Nonpage Mode, One RD#/PSEN# Wait State)

13-9

13-9

External Data Write (Nonpage Mode, One WR# Wait State)

13-9

13-10

External Code Fetch (Nonpage Mode, One ALE Wait State)

13-10

13-11

Real-time Wait State Control Register (WCON)

13-11

13-12

External Code Fetch/Data Read (Nonpage Mode, RT Wait State)

13-13

13-13

External Data Write (Nonpage Mode, RT Wait State)

13-13

13-14

External Data Read (Page Mode, RT Wait State)

13-14

13-15

External Data Write (Page Mode, RT Wait State)

13-14

13-16

Configuration Byte Bus Cycles

13-15

13-17

Bus Diagram for Example 1: 80C251SB in Page Mode

13-18

13-18

Address Space for Example 1

13-19

13-19

Bus Diagram for Example 2: 80C251SB in Page Mode

13-20

13-20

Address Space for Example 2

13-21

13-21

Bus Diagram for Example 3: 87C251SB/83C251SB in Nonpage Mode

13-22

13-22

Address Space for Example 3

13-23

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Intel 8XC251SB, 8XC251SA, 8XC251SP, 8XC251SQ, Embedded Microcontroller manual 10-1
Page 12 Page 14

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.