HT67F60 datasheet(155/242 Pages) HOLTEK

155 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

154

March 06 , 2012

Rev. 1.50

155

March 06 , 2012

The reference voltage supply to the A/D Converter can be supplied from either the positive power

supply pin, VDD, or from an external reference sources supplied on pin VREF. The desired selection

is made using the VREFS bit. As the VREF pin is pin-shared with other functions, when the VREFS

bit is set high, the VREF pin function will be selected and the other pin functions will be disabled

automatically.

A/D Input Pins

All of the A/D analog input pins are pin-shared with the I/O pins on Port A, PH0~PH3 as well as

other functions. The ACE11~ ACE0 bits in the ACERH and ACERL registers, determine whether

the input pins are setup as A/D converter analog inputs or whether they have other functions. If the

ACE11~ ACE0 bits for its corresponding pin is set high then the pin will be setup to be an A/D

converter input and the original pin functions disabled. In this way, pins can be changed under

program control to change their function between A/D inputs and other functions. All pull-high

resistors, which are setup through register programming, will be automatically disconnected if the

pins are setup as A/D inputs. Note that it is not necessary to first setup the A/D pin as an input in the

PAC or PHC port control register to enable the A/D input as when the ACE11~ ACE0 bits enable an

A/D input, the status of the port control register will be overridden.

The A/D converter has its own reference voltage pin, VREF, however the reference voltage can also

be supplied from the power supply pin, a choice which is made through the VREFS bit in the

ADCR1 register. The analog input values must not be allowed to exceed the value of VREF.

PA 0/ AN 0

PH 3/ AN 11

1. 25 V

V 125E N

Bu ffe r

PB 5/ VR EF

VD D

VR EF S

V RE F

12- bi t A DC

B andgap

Re fe r enc e

Vo lt ag e

I npu t V ol ta g e

AC S4 ~A CS 0

A/D Input Structure

HT67F60 Datasheet(PDF) 155 Page - Holtek Semiconductor Inc

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