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IBM MiEM78P468N LCD Driver, 1 R9/LCDCR LCD Control Register, Bits 6 ~ 5 DS1 ~ DS0 LCD duty select

Models: MiEM78P468L MiEM78P468N

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EM78P468N/EM78P468L

 

 

8-Bit Microcontroller

Table 3 Interrupt Vector

 

 

 

 

 

 

 

 

 

Interrupt Vector

 

Interrupt Status

 

0003H

 

TCC overflow interrupt.

 

0006H

 

External interrupt P5.4/INT0 pin

 

 

 

 

 

0009H

 

External interrupt P5.5/INT1 pin

 

 

 

 

 

000CH

 

Counter 1 underflow interrupt

 

000FH

 

Counter 2 underflow interrupt

 

 

 

 

 

0012H

 

High-pulse width timer underflow interrupt

 

 

 

 

 

0015H

 

Low-pulse width timer underflow interrupt

 

0018H

 

Port 6, Port 8 input status change wake up

 

 

 

 

 

 

6.9 LCD Driver

This LSI can drive an LCD of up to 32 segments and 4 commons that can drive a total of 4⋅32 dots. The LCD block is made up of an LCD driver, display RAM, segment output pins, common output pins, and LCD operating power supply pins. This circuit works on normal mode, green mode and idle mode. The LCD duty; bias; the number of segment; the number of common and frame frequency are determined by the LCD controller register.

The basic structure contains a timing control that uses a subsystem clock to generate the proper timing for different duty and display accesses. The R9 register is a command register for the LCD driver which includes LCD enable/disable, bias (1/2 and 1/3), duty (1/2, 1/3, 1/4), and LCD frame frequency control. The register RA is an LCD contrast and LCD RAM address control register. The register RB is an LCD RAM data buffer. LCD booster circuit can change the operation frequency to improve VLCD2 and VLCD3 drive capability. The control register is described as follows.

6.9.1 R9/LCDCR (LCD Control Register)

Bit 7

 

Bit 6

Bit 5

 

Bit 4

 

Bit

3

BS

 

DS1

DS0

 

LCDEN

 

−

 

 

 

 

 

 

 

 

 

 

 

Bit 2

 

Bit 1

 

Bit 0

 

LCDTYPE

 

LCDF1

 

LCDF0

 

 

 

 

 

 

Bit 7 (BS): LCD bias select bit, 0/1=> (1/2 bias) / (1/3 bias)

Bits 6 ~ 5 (DS1 ~ DS0): LCD duty select

DS1

 

DS0

 

LCD Duty

 

0

 

0

 

1/2 duty

 

 

 

 

 

0

 

1

 

1/3 duty

1

 

⋅

 

1/4 duty

 

 

 

 

 

 

Bit 4 (LCDEN): LCD enable bit

“0”: disable the LCD circuit

“1”: enable the LCD circuit

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 LCD Driver, 1 R9/LCDCR LCD Control Register, Bits 6 ~ 5 DS1 ~ DS0 LCD duty select
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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.