HE84G762B datasheet(44/60 Pages) KB

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KING BILLION ELECTRONICS CO., LTD

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HE84G762B

HE80004 Series

June 1, 2004

V0.92

This specification is subject to change without notice. Please contact sales person for the latest version before use.

CPU

bias &

filter

circuit

VDD

VO(DAO)

SPEAKER

The VOC is a three bit voice control register in the 7-bit mode.

VOC

address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Field

0x13

PWM

DAC

Reset

PWM: ‘1’ PWM output enabled; ‘0’ PWM output disabled.

DAC: ‘1’ DAC enabled; ‘0’ DAC disabled.

OP: ‘1’ DAC uses DAO pin as output pin; ‘0’ DAC uses VO pin as output pin.

19. Low Voltage Detection/Reset

The low voltage detection is used to detect low battery or low power condition. There are 4 options on the

detection level selectable by mask option MO_DLVL. The low voltage detection circuit can be turned off

by clearing LVDE bit, and the status of supply power can be read out at bit LVDO of LVDC register

(extension register 0x17h).

MO_DLVL

Detection voltage

2.4 volts

2.6 volts

2.8 volts

3.0 volts

LVDC

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Field

LVDO

LVDE

Mode

Reset

LVDO: ‘0’

Battery level low; ‘1’

Battery level high

LVDE: ‘0’

Disable voltage Detection; ‘1’

Enable voltage Detection

Low voltage reset circuit prevents the CPU from operating below its physical limit. When the supply

voltage drops below VDET (2.2Volt), the CPU will be held in reset state until the supply voltage rises to

VRLS. Then CPU will be released from reset state. VRLS will be higher than VDET by 5% to provide

hysteresis and prevent CPU from bouncing back and forth between reset and operating state. The low

voltage reset function can be enabled or disabled by mask option MO_LVRE.

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