EM78P458/459

OTP ROM

0 = The Vref of the ADC is connected to Vdd (default value), and the P53/VREF pin carries out the function of P53;

1 = The Vref of the ADC is connected to P53/VREF.

• CE (Bit 6): Control bit used to enable comparator. 0 = Disable comparator

1 = Enable comparator

• COE (Bit 5): Set P57 as the output of the comparator 0 = the comparator acts as an OP if CE=1.

1 = act as a comparator if CE=1.

•IMS2~IMS0 (Bit 4 ~ Bit 2): ADC configuration definition bit.

•CKR1 and CKR0 (Bit 1 and Bit 0): The conversion time select.

00 = Fosc/4;

01 = Fosc/16;

10 = Fsco/64;

11 = The oscillator clock source of ADC is from WDT ring oscillator frequency. ( frequency=256/18ms≒14.2Khz)

1.3 GCON/IOC90

As shown in Fig. 12, OP1 and OP2, the gain amplifiers, are located in the middle of the analog input pins (ADC1 and ADC5) and the 8-1analog switch. The GCON register controls the gains.

Table 7 Table 7 Shows the Gains and the Operating Range of ADC.

BIT

7

 

6

5

 

4

 

3

2

1

0

SYMBOL

OP2E

 

OP1E

G22

 

G21

 

G20

G12

G11

G10

*Init_Value

0

 

0

0

 

0

 

0

0

0

0

Table 8 The Gains and the Operating Range of ADC

 

 

 

 

 

 

 

 

 

 

 

 

 

G10:G12/G20:G22

Gain

 

Range of Operating Voltage

 

 

 

 

000

 

1

 

 

 

0 ~ Vref

 

 

 

 

 

001

 

2

 

 

0 ~ (1/2)Vref

 

 

 

 

 

010

 

4

 

 

0 ~ (1/4)Vref

 

 

 

 

 

011

 

8

 

 

0 ~ (1/8)Vref

 

 

 

 

 

100

 

16

 

 

0 ~ (1/16)Vref

 

 

 

 

 

101

 

32

 

 

0 ~ (1/32)Vref

 

 

 

 

 

<Note> Vref can not be less than 3 volts.

2. ADC Data Register (ADDATA/RA)

This specification is subject to change without prior notice.

33

07.01.2003 (V1.3)

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Image 33
ELAN Home Systems EM78P458AP manual ADC Data Register ADDATA/RA, CKR1 and CKR0 Bit 1 and Bit 0 The conversion time select
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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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