HT85F2270 datasheet(164/226 Pages) HOLTEK

164 / 226 page

Rev. 1.00

164 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

31 Digital to Analog Converter – DAC

All devices include a Digital to Analog Converter permitting the conversion of a 12-bit digital

value into an analog voltage. An additional programmable attenuation control function provides

further flexibility over the overall input/output transfer function.

DAC Register Description

A pair of data register, DAL and DAH, store the 12-bit digital value which is to be converted, while

an additional control register, DACTRL, controls the attenuation level, reference voltage select and

enable/disable control.

DAH Register

SFR Address: B5h

Bit

Name

D11

D10

D�

R/W

POR

Bit 7~0

D11~D4: DAC output data bit 11~4

DAL Register

SFR Address: B4h

Bit

Name

D�

—

R/W

—

POR

—

Bit 7~4

D3~D0: DAC output data bit 3~0

Bit 3~0

Unimplemented, read as “0”

DACTRL Register

SFR Address: B3h

Bit

Name

VOL�

VOL1

VOL0

—

VREFDS

DACEN

R/W

—

R/W

POR

—

Bit 7~5

VOL2~VOL0: DAC attenuation control

There are 8 levels of DAC attenuation selected using these three bits. The accompanying

table illustrates the relationship between the DAC attenuation control bits and the DAC

data output.

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