EM78P468N/EM78P468L

8-Bit Microcontroller

6.4 I/O Ports

The I/O registers, (Port 5, Port 6, Port 7 and Port 8), are bi-directional tri-state I/O ports. Port 6 and Port 8 are pulled-high internally by software; Port 6 is also pulled-low internally by software. Furthermore, Port 6 has its open-drain output also through software. Port 6 and Port 8 features an input status changed interrupt (or wake-up) function and is pulled-high by software. Each I/O pin can be defined as "input" or "output" pin by the I/O control register (IOC50 ~ IOC80). The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits are shown in Fig. 6-5.

Note: Open-drain, pull-high, and pull down are not shown in the figure.

Fig. 6-5 The Circuit of I/O Port and I/O Control Register for Port 5 ~ 8

6.5 Reset and Wake-up

A reset can be activated by

„POR (Power-on Reset)

„WDT timeout. (if enabled)

„/RESET pin goes to low.

Note: The reset circuit is always enabled. It will reset the CPU at 1.9V.

Once a reset occurs, the following functions are performed

„The oscillator is running, or will be started.

„The program counter (R2/PC) is set to all "0".

„All I/O port pins are configured as input mode (high-impedance state).

„The TCC/Watchdog timer and prescaler are cleared.

„When power is on, the Bits 5 and 6 of R3 and the upper two bits of R4 are cleared.

„Bits of the IOC71 register are set to all "1" except for Bit 6 (INT flag).

„For other registers, see Table 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 I/O Ports, Reset and Wake-up
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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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