EM78P458/459

OTP ROM

4. FUNCTION DESCRIPTION

WDT Prescaler

Time-out

Oscillator/

Timming

Control

ENTCC

R1(TCC)

Sleep

&

Wake Up

Control

WDT Timer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/INT

 

 

ROM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Interrupt

 

 

 

 

Instruction

 

 

 

 

Control

 

 

 

 

Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RAM

 

 

 

 

 

 

Instruction

 

 

 

 

 

 

 

 

 

 

 

 

 

Decoder

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DATA & CONTROL BUS

P C

R3

STACK 0

STACK 1

STACK 2

STACK 3

STACK 4

STACK 5

STACK 6

STACK 7

ALU

ACC

Comparators

IOC5

R5

PPPPPPPP 5555 55 55 0123 45 67

2 PWMs

8 ADC

IOC6

R6

PPPPPPPP 6 666666 6 0 123456 7

Fig. 2 The Functional Block Diagram of EM78P458/459

4.1 Operational Registers

1. R0 (Indirect Addressing Register)

R0 is not a physically implemented register. Its major function is to perform as an indirect addressing pointer. Any instruction using R0 as a pointer, actually accesses data pointed by the RAM Select Register (R4).

2.R1 (Time Clock /Counter)

•Increased by an external signal edge through the TCC pin, or by the instruction cycle clock.

•The signals to increase the counter are decided by Bit 4 and Bit 5 of the CONT register.

•Writable and readable as any other registers.

3.R2 (Program Counter) & Stack

•R2 and hardware stacks are 12-bit wide. The structure is depicted in Fig. 4.

•Generates 4K⋅13 bits on-chip ROM addresses to the relative programming instruction codes. One program page is 1024 words long.

This specification is subject to change without prior notice.

8

07.01.2003 (V1.3)

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ELAN Home Systems EM78P458AM, EM78P459AK manual Function Description, Operational Registers, R0 Indirect Addressing Register
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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.
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