EM78P468N/EM78P468L

8-Bit Microcontroller

6.10 Infrared Remote Control Application/PWM Waveform Generate

This LSI can output infrared carrier in user-friendly or in PWM standard waveform. The IR and PWM waveform generated functions include an 8-bit down count timer/counter, high-pulse width timer, low-pulse width timer, and IR control register. The IR system block diagram is shown in Fig. 6-20. The IROUT pin waveform is determined by IR control register (RE), IOC90 (Counters 1 and 2 control register), IOCA0 (high-pulse width timer, low-pulse width timer control register), IOCC0 (Counter 2 preset), IOCD0 (high-pulse width timer preset register), and IOCE0 (low-pulse width timer preset register). Details on Fcarrier, high-pulse time, and low pulse time are explained as follows:

If Counter 2 clock source is FT (this clock source can be set by IOC91), then

Fcarrier =

 

 

 

 

FT

 

 

 

2 ⋅ (1 + decimal

of C ounter

2

preset

value

( IOCC 0)) ⋅ prescaler

 

If the high-pulse width timer clock source is FT (this clock source can be set by IOCA1), then

 

 

prescaler

⋅ (1 + decimal

of

high

pulse

width timer value ( IOCD 0))

Thigh pulse time =

 

 

 

 

 

 

 

 

 

 

 

FT

 

 

 

 

 

 

 

 

 

 

If the low-pulse width timer clock source is FT (this clock source can be set by IOCA1);

Tlow pulse time

Fs Fm

prescaler

⋅ (1 + decimal

of

low

pulse

width

timer value

( IOCE 0))

=

 

 

 

FT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pre-scaler

 

 

 

 

 

 

 

(IOCA1)

 

 

High-Pulse Width Timer

Low -Pulse Width Timer

 

 

 

(IOCD0)

 

 

( IOCE0)

 

 

 

8

 

 

 

8

 

 

A uto-reloadbuffer

 

A uto-reloadbuffer

 

Pre-scaler

(IOC A1)

Pre-s caler

(IOC91)

Fcarrier

8 bit dow n counter

8

 

 

8

 

 

 

8

 

 

8 bit dow n counter

 

8 bit dow n counter

 

 

 

 

 

 

 

 

8

 

 

 

8

 

 

 

 

 

 

 

 

H/W Modulator Circuit

IROUTpin

A uto-reloadbuffer

HF

LGP

IRE

 

8

Counter 2 (IOCC0)

REregister

Fm: main oscillator frequency Fs: sub-oscillator frequency

Fig. 6-20 IR/PWM System Block Diagram

Product Specification (V1.5) 02.15.2007

41

(This specification is subject to change without further notice)

Page 47
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IBM MiEM78P468N, MiEM78P468L manual Infrared Remote Control Application/PWM Waveform Generate

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.