HT45F43 datasheet(129/152 Pages) HOLTEK

129 / 152 page

Voice Output

Voice Control

The voice control register controls the DAC circuit. If the DAC circuit is not enabled, any DAH/DAL

outputs will be invalid. Writing a

²1² to the DACEN bit will enable the DAC circuit and channel the

DAC output to its corresponding I/O pin, while writing a

²0² to the DACEN bit will disable the DAC

circuit.

Audio Output and Volume Control

- DAL, DAH, DACTRL

The audio output is 12-bits wide whose highest 8-bits are written into the DAH register and whose

lowest four bits are written into the highest four bits of the DAL register. Bits 0~3 of the DAL register

are always read as zero.

There are 8 levels of volume which are setup using the DACTRL register. The highest 3-bits of this

not. Once the DACEN bit is set to

²1², this will channel the DAC output to the I/O pin and disable the

original I/O pin shared function.

DACTRL Register

Bit

76543210

Name

VOL2

VOL1

VOL0

¾¾¾¾

DACEN

R/W

¾¾¾¾

R/W

POR

¾¾¾¾

Bit 7~5

VOL2~VOL0: DAC volume control data

Bit 4~1

unimplemented, read as

²0²

Bit 0

DACEN: DAC enable control bit

0: disable

1: enable

Note: When the DACEN is set to

²1², the DAC signal will be channeled to the I/O pin and

disable the original I/O pin shared function.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

129

September 15, 2011

D A L R e g i s t e r

b 7

b 0

N o t u s e d , r e a d a s " 0 "

D 3

D 2

D 1

D 0

A u d i o o u t p u t

D i g i t a l t o A n a l o g D a t a L o w R e g i s t e r

D A H R e g i s t e r

b 7

b 0

D 1 1 D 1 0 D 9

D 8

A u d i o o u t p u t

D i g i t a l t o A n a l o g D a t a H i g h R e g i s t e r

D 7

D 6

D 5

D 4

HT45F43 Datasheet(PDF) 129 Page - Holtek Semiconductor Inc

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