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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.

Bit

Name

Value

Function description

PWM Output Driver Enable

VOC[3] PWME

PWM Output Driver Disable

PWM Module Enable

VOC[2]

PWM

PWM Module Disable

Digital-to-Analog Converter Enable

VOC[1]

DAC

Digital-to-Analog Converter Disable

DAC output to DAO pin

VOC[0]

DAC output to VO pin

The pulse-width modulator (PWM) converts 8-bit unsigned speech data which is written into PWMC data

PWMC with Digit-to-Analog Converter. So PWM and DA output can exist at the same time. When PWM

circuit is enabled, it generates signal with duty ratio in proportion to the value of PWMC register.

DA = 0x20

DA = 0x80

DA = 0xE0

1 subframe

PWMC

address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

Field

0x0E

DA7

DA6

DA5

DA4

DA3

DA2

DA1

DA0

VOC

address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Field

0x13

PWM O/P driver

PWME

PWM

DAC

Reset

The PWM bit of VOC controls the enable/disable of the PWM circuit and output driver. When PWM bit

of VOC is ‘0’, PWME bit and output drivers are both cleared. To use PWM as voice output, PWM bit has

to be set to ‘1’ first, then set PWME bit and enable output driver by setting the driver number. If PWM bit

is disabled and enabled again, the setting for driver and PWME bit will be clear.

The Fast Clock is gated through PWME bit of VOC register to provide the clock source of PWM circuit

when it is enabled. As PWM needs higher frequency to operate, it cannot generate correct PWM signal in

Slow clock only mode.

When the program enters into sleep mode or idle mode, it will automatically turn off all voice outputs by

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