EM78P808 datasheet(49/63 Pages) EMC

49 / 63 page

EM78808

8-bit Micro-controller

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* This specification is subject to change without notice.

8/1/2004 (V3.1)

VII.10 Differential Energy Detector (DED)

DED

DEDD

EGIN1

DEDTHD

DEDPWR

EGCLK

EGIN2

Fig.27 DED

The Differential Energy Detector is differential input level and zero crossing detector named as DED. It

can detect any incoming AC signal above its threshold level and output corresponding zero-crossing frequency

pulse. For this energy detector, the user can set it’s minimum detection threshold level at –35dBm or –45dBm

by DEDTHD bit. All the minimum detection value can be achieved under input capacitor more than 4700pF and

input resistor around 100k ohms. The energy detector has power control by IOCE PAGE2 bit 1 (DEDPWR).

Descriptions

RE bit 7 (DEDD)

DEDD : Output data of DED

IOCE PAGE2

bit 5 (EDGE)

EDGE : edge control of DED output data

1/0 => Falling edge trig. / Rising edge and Falling edge trig.

IOCE PAGE2

bit 4 (WUEDD)

WUEDD : Wake-up control of DED output data

1/0 => enable/disable

RE PAGE1 bit 6 (DED)

DED : Interrupt flag of DED output data

IOCE PAGE2 bit6

(DED)

DED : Interrupt mask of DED output data

1/0

enable/disable interrupt of DED output data

IOCE PAGE2 bit 0

(DEDTHD)

DEDTHD : Minimum detection threshold of DED

0/1

-45dBm/-35dBm

IOCE PAGE2 bit 1

(DEDPWR)

DEDPWR : Power control of DED

0/1

power off/power on

IOCE PAGE2 bit 2

(DEDCLK)

DEDCLK : operating clock of DED

0 : low frequency clock

1 : high frequency clock

VIII. Absolute Operation Maximum Ratings

RATING

SYMBOL

VALUE

UNIT

DC SUPPLY VOLTAGE

VDD

-0.3 To 6

INPUT VOLTAGE

Vin

-0.5 to VDD +0.5

OPERATING TEMPERATURE RANGE

0 to 70

℃

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