EM78P458/459

OTP ROM

3. PWM Period ( PRDX : PRD1 or PRD2 )

The PWM period is defined by writing to the PRDX register. When TMRX is equal to PRDX, the following events occur on the next increment cycle:

TMRX is cleared.

The PWMX pin is set to 1.

The PWM duty cycle is latched from DT1/DT2 to DTL1/DTL2. < Note > The PWM output will not be set, if the duty cycle is 0;

The PWMXIF pin is set to 1.

The following formula describes how to calculate the PWM period:

PERIOD = (PRDX + 1) * 4 * (1/Fosc) * (TMRX prescale value )

4.PWM Duty Cycle ( DTX: DT1H/ DT1L and DT2H/ DT2L; DTL: DL1H/DL1L and DL2H/DL2L )

The PWM duty cycle is defined by writing to the DTX register, and is latched from DTX to DLX while TMRX is cleared. When DLX is equal to TMRX, the PWMX pin is cleared. DTX can be loaded at any time. However, it cannot be latched into DTL until the current value of DLX is equal to TMRX.

The following formula describes how to calculate the PWM duty cycle:

Duty Cycle = (DTX) * (1/Fosc) * (TMRX prescale value )

5. Comparator X

To change the output status while the match occurs, the TMRXIF flag will be set at the same time.

6.PWM Programming Procedures/Steps

(1)Load PRDX with the PWM period..

(2)Load DTX with the PWM Duty Cycle.

(3)Enable interrupt function by writing IOCF0, if required.

(4)Set PWMX pin to be output by writing a desired value to IOC51.

(5)Load a desired value to IOC51 with TMRX prescaler value and enable both PWMX and TMRX.

This specification is subject to change without prior notice.

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ELAN Home Systems EM78P458AP, EM78P459AK manual PWM Period Prdx PRD1 or PRD2, Comparator, PWM Programming Procedures/Steps

EM78P458, EM78P459AM, EM78P458AM, EM78P459AK, EM78P459 specifications

ELAN Home Systems offers a range of advanced microcontrollers, including the EM78P458AP, EM78P459, EM78P459AK, EM78P458AM, and EM78P459AM, that cater to various applications in the consumer electronics sector. These microcontrollers are known for their high efficiency, low power consumption, and robust performance, making them ideal for a wide range of smart home devices.

The EM78P458AP and EM78P459 models feature an 8-bit architecture, enabling efficient processing for applications requiring moderate complexity. They are equipped with a variety of I/O options, including GPIO, UART, and ADC, facilitating seamless integration with numerous peripherals. This flexibility allows developers to create customized solutions tailored to specific user needs.

One of the main highlights of these microcontrollers is their low-power operation, which is essential for battery-operated devices. This is particularly appealing in smart home contexts, where devices are expected to maintain long operational lifetimes without frequent battery replacements. The EM78P458AP and EM78P459 series prioritize energy efficiency, ensuring that they consume minimal power during both active and idle states.

In terms of memory, these microcontrollers also provide substantial ROM and RAM capacities, which enhance their ability to handle complex programs and data. The EM78P459AK variant adds additional features that empower developers with greater flexibility in terms of code storage and execution.

Another critical aspect of these microcontrollers is their built-in protection mechanisms, including voltage and thermal protection, which ensure safe operations under varying environmental conditions. This is vital for home automation systems, where device reliability is paramount to user satisfaction.

The EM78P458AM and EM78P459AM models further extend the family with added functionalities, such as enhanced communication capabilities featuring protocols like I2C and SPI. This facilitates robust inter-device communication, making it easier to integrate various smart home devices into a cohesive network.

Overall, ELAN Home Systems’ EM78P458 and EM78P459 series microcontrollers stand out for their versatile application potential, low power consumption, and reliability. With their innovative technologies and characteristics, they are well-suited for driving the next generation of smart home solutions, ensuring convenience, efficiency, and connectivity for users worldwide.