On-chip Oscillator Ceramic Resonator, Cmos | Intel 8XC251SQ specification

8XC251SA, SB, SP, SQ USER’S MANUAL

For a more in-depth discussion of crystal specifications, ceramic resonators, and the selection of C1 and C2 see Applications Note AP-155, “Oscillators for Microcontrollers,” in the Embedded Applications handbook.

11.3.2 On-chip Oscillator (Ceramic Resonator)

In cost-sensitive applications, you may choose a ceramic resonator instead of a crystal. Ceramic resonator applications may require slightly different capacitor values and circuit configuration. Consult the manufacturer’s data sheet for specific information.

11.3.3 External Clock

To operate the CHMOS 8XC251Sx from an external clock, connect the clock source to the XTAL1 pin as shown in Figure 11-3. Leave the XTAL2 pin floating. The external clock driver can be a CMOS gate. If the clock driver is a TTL device, its output must be connected to VCC through a 4.7 kΩ pullup resistor.

External

Clock

CMOS

Clock Driver

N/C

XTAL1

XTAL2

VSS

Note: If TTL clock driver is used, connect a 4.7kΩ pullup resistor from driver output to VCC.

A4142-03

Figure 11-3. External Clock Connection

11-4

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.

Intel 8XC251SQ, 8XC251SA, 8XC251SP manual On-chip Oscillator Ceramic Resonator, External Clock, Cmos

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