EM78P468N/EM78P468L

8-Bit Microcontroller

Bits 6~4 (CLK2~0) of RD: main clock selection bits for PLL mode (code option select)

CLK2

 

CLK1

 

CLK0

 

Main clock

Example Fs=32.768KHz

0

 

0

 

0

 

Fs⋅130

4.26 MHz

0

 

0

 

1

 

Fs⋅65

2.13 MHz

0

 

1

 

0

 

Fs⋅65/2

1.065 MHz

 

 

 

 

 

 

 

 

0

 

1

 

1

 

Fs⋅65/4

532 kHz

1

 

⋅

 

⋅

 

Fs⋅244

8 MHz

 

 

 

 

 

 

 

 

6.6.3Crystal Oscillator/Ceramic Resonators (Crystal)

This LSI can be driven by an external clock signal through the R-OSCI pin as shown in Fig.6-7 below. In most applications, the R-OSCI pin and the OSCO pin can be connected with a crystal or ceramic resonator to generate oscillation. Fig. 6-8 depicts such circuit. Table 5 provides the recommended values of C1 and C2. Since each resonator has its own attribute, user should refer to its specification for appropriate values of C1 and C2. RS, a serial resistor, may be necessary for AT strip cut crystal or low frequency mode.

R-OSCI

EM78P468N

OSCO

Fig. 6-7 External Clock Input Circuit

R-OSCI

EM78P468N

OSCO

 

C1

XTAL

 

Rs

C2

Xin

EM78P468N

Xout

C1

XTAL

Rs C2

Fig. 6-8 Circuit for Crystal/Resonator

Table 5 Capacitor Selection Guide for Crystal Oscillator or Ceramic Resonators

Oscillator Source

Oscillator Type

Frequency

C1 (pF)

C2 (pF)

 

 

455 kHz

 

Ceramic Resonators

 

 

2.0 MHz

 

 

 

 

 

4.0MHz

Main oscillator

 

 

 

455kHz

 

Crystal Oscillator

1.0MHz

 

2.0MHz

 

 

 

 

 

 

 

4.0MHz

 

 

 

Sub-oscillator

Crystal Oscillator

32.768kHz

100~150

20~40

10~30

20~40

15~30

15

15

25

100~150

20~40

10~30

20~150

15~30

15

15

25

Product Specification (V1.5) 02.15.2007

• 31

(This specification is subject to change without further notice)

Page 36 Page 38
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IBM MiEM78P468N, MiEM78P468L manual Crystal Oscillator/Ceramic Resonators Crystal, Main clock Example Fs=32.768KHz
Page 36 Page 38

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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