EM78P468N/EM78P468L

8-Bit Microcontroller

6.6.4RC Oscillator Mode with Internal Capacitor

If both precision and cost are taken into consideration, this LSI also offers a special oscillation mode, which has an on-chip internal capacitor and an external resistor connected to VDD. The internal capacitor functions as temperature compensator. In order to obtain more accurate frequency, a precise resistor is recommended.

R-OSCI or Xin

EM78P468N

VDD

Rext

Fig. 6-9 Circuit for Internal C Oscillator Mode

Table 6

RC Oscillator Frequencies

 

 

 

 

 

 

 

 

Pin

 

 

Rext

 

Average Fosc 5V, 25°C

Average Fosc 3V, 25°C

 

 

 

51k

 

2.2221 MHz

2.1972 MHz

R-OSCI

 

 

100k

 

1.1345 MHz

1.1203 MHz

 

 

 

300k

 

381.36kHz

374.77kHz

Xin

 

 

2.2M

 

32.768kHz

32.768kHz

 

 

 

 

 

 

 

Note: Measured from QFP packages with frequency drift of about ±30%.

Values are provided for design reference only.

6.7 Power-on Considerations

Any microcontroller (as with this LSI) is not warranted to start operating properly before the power supply stabilizes in a steady state. This LSI has an on-chip Power-on Reset (POR) with detection level range as shown on the table below. The circuitry eliminates the extra external reset circuit but will work well only if the VDD rises quickly enough (50 ms or less). However, under critical applications, extra devices are still required to assist in solving power-on problems.

Power-on voltage detector provided

IC

Voltage Range

EM78P468N

1.9V to 2.1V

 

 

EM78P468L

1.6V to 1.8V

 

 

32 •

Product Specification (V1.5) 02.15.2007

(This specification is subject to change without further notice)

Page 37 Page 39
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Image 38
IBM MiEM78P468L manual Power-on Considerations, RC Oscillator Mode with Internal Capacitor, RC Oscillator Frequencies
Page 37 Page 39

MiEM78P468L, MiEM78P468N specifications

The IBM MiEM78P468N and MiEM78P468L are advanced integrated circuit solutions that cater primarily to the needs of enterprise-level computing systems. These microprocessors are integral in handling a variety of complex tasks, thereby empowering businesses with the efficiency and speed required in today's fast-paced digital environment.

Both models utilize the cutting-edge 78P architecture, which provides impressive performance capabilities. The MiEM78P468N operates at a clock speed of up to 2.2 GHz, while the MiEM78P468L offers a lower clock speed optimized for energy efficiency. This distinction makes the N version ideal for high-performance applications, whereas the L version appeals to scenarios where power consumption is a critical consideration.

A key characteristic of both models is their multi-core architecture, supporting up to four cores. This feature allows for enhanced parallel processing, enabling the handling of multiple tasks simultaneously—a vital requirement for data-intensive applications. Moreover, the inclusion of advanced cache memory arrangements enhances data retrieval speeds significantly, ensuring that applications run smoothly without performance bottlenecks.

These processors also employ cutting-edge thermal management technologies. The dynamic voltage and frequency scaling (DVFS) capabilities ensure that performance can be adjusted in real-time based on workload requirements, helping to minimize energy consumption. This is particularly beneficial in maintaining optimal operating temperatures and prolonging the lifespan of the hardware.

Another notable feature is support for advanced security protocols. Both models incorporate hardware-based security technologies that safeguard data integrity and protect against unauthorized access. This is becoming increasingly important in today's cybersecurity landscape where businesses must prioritize protecting sensitive information.

Additionally, the IBM MiEM78P468N and MiEM78P468L processors are compatible with a wide range of operating systems, facilitating seamless integration into various IT environments. Their robust architecture supports extensive peripheral interconnect protocols, enhancing expandability and connectivity options.

In summary, the IBM MiEM78P468N and MiEM78P468L processors stand out for their performance capabilities, energy efficiency, advanced security features, and versatility. They are well-suited for organizations looking to enhance their computing power while maintaining a balance between performance and power consumption. These microprocessors are instrumental in driving innovation and efficiency in enterprise computing.
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