EM78P468N/EM78P468L

8-Bit Microcontroller

6.7.1External Power-on Reset Circuit

This circuit implements an external RC to produce a reset pulse (see Fig. 6-10). The pulse width (time constant) should be kept long enough to allow VDD to reach minimum operation voltage. This circuit is used when the power supply rise time is slow.

Because the current leakage from the /RESET pin is ±5μA, it is recommended that R should not be greater than 40K. In this way, the voltage at Pin /RESET is held below 0.2V. The diode (D) acts as a short circuit at power-down. The capacitor, C, is discharged rapidly and fully. Rin, the current-limited resistor, prevents high current discharge or ESD (electrostatic discharge) from flowing into Pin /RESET.

Fig. 6-10 External Power-on Reset Circuit

6.7.2Residue-Voltage Protection

When battery is replaced, device power (VDD) is disconnected but residue-voltage remains. The residue-voltage may trips below minimum VDD, but above zero. This condition may cause poor power on reset. Fig. 6-11 and Fig. 6-12 show how to build a residue-voltage protection circuit

Fig. 6-11 Residue Voltage Protection Circuit 1

Fig. 6-12 Residue Voltage Protection Circuit 2

Product Specification (V1.5) 02.15.2007

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(This specification is subject to change without further notice)

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IBM MiEM78P468N, MiEM78P468L manual External Power-on Reset Circuit, Residue-Voltage Protection
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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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