EM78P468N/EM78P468L

8-Bit Microcontroller

6.8 Interrupt

This LSI has eight interrupt sources as listed below:

„TCC overflow interrupt.

„External interrupt P5.4/INT0 pin

„External interrupt P5.5/INT1 pin

„Counter 1 underflow interrupt

„Counter 2 underflow interrupt

„High-pulse width timer underflow interrupt

„Low-pulse width timer underflow interrupt

„Port 6, Port 8 input status change wake-up

This IC has internal interrupts which are falling edge triggered or as follows:

„TCC timer overflow interrupt

„Four 8-bits down counter/timer underflow interrupt

If these interrupt sources change signal from high to low, the RF register will generate a “1” flag to the corresponding register if the IOCF0 register is enabled.

RF is the interrupt status register. It records the interrupt request in flag bit. IOCF0 is the interrupt mask register. Global interrupt is enabled by ENI instruction and disabled by DISI instruction. When one of the interrupts (when enabled) is generated, it will cause the next instruction to be fetch from address 0003H~0018H according to interrupt source.

With this LSI, each individual interrupt source has its own interrupt vector as depicted in Table 3. Before the interrupt subroutine is executed, the contents of the ACC and the R3 register are initially saved by the hardware. After the interrupt service routine is completed, the ACC and R3 are restored. The existing interrupt service routine does not allow other interrupt service routine to be executed. Hence, if other interrupts occur while an existing interrupt service routine is being executed, the hardware will save the later interrupts. Only after the existing interrupt service routine is completed that the next interrupt service routine is executed.

Interrupt Source

ACC

ENI / DISI R3

Fig. 6-13 Interrupt Back-up

Interrupt

Occurs

RETI

Diagram

STACKACC

STACKR3

34 •

Product Specification (V1.5) 02.15.2007

(This specification is subject to change without further notice)

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IBM MiEM78P468L, MiEM78P468N manual Interrupt Back-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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