8XC251SA, SB, SP, SQ USER’S MANUAL

set

The term set refers to the value of a bit or the act of

 

giving it a value. If a bit is set, its value is “1”; setting

 

a bit gives it a “1” value.

SFR

Special-function register.

sign extension

A method for converting data to a larger format by

 

filling the extra bit positions with the value of the

 

sign. This conversion preserves the positive or

 

negative value of signed integers.

sink current

Current flowing into a device to ground. Always a

 

positive value.

source-code compatibility

The ability of an MCS 251 microcontroller to execute

 

recompiled source code written for an MCS 51 micro-

 

controller.

source current

Current flowing out of a device from VCC. Always a

 

negative value.

source mode

An operating mode that is selected by a configuration

 

bit. In source mode, an MCS 251 microcontroller can

 

execute recompiled source code written for an MCS

 

51 microcontroller. In source mode, the MCS 251

 

microcontroller cannot execute unmodified binary

 

code written for an MCS 51 microcontroller. See

 

binary mode.

SP

Stack pointer.

SPX

Extended stack pointer.

state time (or state)

The basic time unit of the device; the combined

 

period of the two internal timing signals, PH1 and

 

PH2. (The internal clock generator produces PH1 and

 

PH2 by halving the frequency of the signal on

 

XTAL1.) With a 16-MHz crystal, one state time

 

equals 125 ns. Because the device can operate at

 

many frequencies, this manual defines time require-

 

ments in terms of state times rather than in specific

 

units of time.

UART

Universal asynchronous receiver and transmitter. A

 

part of the serial I/O port.

WDT

Watchdog timer, an internal timer that resets the

 

device if the software fails to operate properly.

Glossary-6

 

 

 

 

 

 

 

 

 

 

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