King Billion Electronics Co., Ltd

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HE83005

HE80000 SERIES

July 28, 2003

9

V3.4

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

10. PWM & DAC

The current DAC output pin is VO and its primary function is intended for speech generation, but the

DAC output path can be used in conjunction with built-in OP comparator to function as an

Analog-to-Digital Converter for applications such as speech recording, speech recognition or sensor

interfaces.

PWM

Command

Register

#reset

VOC[2]

PWMC[6..0]

clk

PWMC[7]

Write_Strobe

PWMC_

REG[0]

PWM

Driver

PWMC_REG[6..4]

#reset

clk

7-bit

PWM Data

Register

Fast_clock

clk

PWMO_REG[6..0]

PWMP

PWMN

VO

7-bit Voice Output Architecture

DAC

VOC[1]

VOC[2]

The 7-bit voice output is controlled by PWMC and VOC register, and the PWMC is a command/data

register which is determined by PWMC[7] bit. The voice output control (VOC) register is used to control

the PWM and DAC enable/disable. These two functions can be enabled simultaneously.

VOC

address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Field

0x13

-

-

-

-

-

PWM

DAC

Reserved

Reset

-

-

-

-

-

0

0

0

Bit

Name

Value

Function description

1

PWM Module Enable

VOC[2]

PWM

0

PWM Module Disable

1

Digital-to-Analog Converter Enable

VOC[1]

DAC

0

Digital-to-Analog Converter Disable