HT67F60 datasheet(149/242 Pages) HOLTEK

149 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

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

Rev. 1.50

148

March 06 , 2012

Rev. 1.50

149

March 06 , 2012

A/ D C onv er te r

PA 0/ AN 0~ PA 7/ AN 7

PH 0/ AN 8

PH 1/ AN 9

PH 2/ AN 10

PH 3/ AN 11

A/ D Re fe r enc e Vo lt age

AD RL

AD RH

A/ D Da ta

R egi s te rs

V 125E N

ST AR T EO CB AD OF F

V SS

PB 5/ VR EF

AD CK 2~ A DCK 0

f SY S

AC E 11~ AC E0

AC S4 ~A CS 0

1. 25 V

A/ D Cl oc k

V DD

AD OF F

Bi t

VR EF S

Bi t

AD RF S

bi t

¸ 2 N

(N =0 ~6 )

A/D Converter Structure

A/D Converter Data Registers – ADRL, ADRH

As the devices contain an internal 12-bit A/D converter, they require two data registers to store the

converted value. These are a high byte register, known as ADRH, and a low byte register, known as

ADRL. After the conversion process takes place, these registers can be directly read by the

microcontroller to obtain the digitised conversion value. As only 12 bits of the 16-bit register space

is utilised, the format in which the data is stored is controlled by the ADRFS bit in the ADCR0

unused bits will be read as zero.

ADRFS

ADRH

ADRL

D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

A/D Data Registers

A/D Converter Control Registers – ADCR0, ADCR1, ACERL, ACERH

To control the function and operation of the A/D converter, three or four control registers known as

ADCR0, ADCR1, ACERL and ACERH are provided. These 8-bit registers define functions such as

the selection of which analog channel is connected to the internal A/D converter, the digitised data

format, the A/D clock source as well as controlling the start function and monitoring the A/D

converter end of conversion status. The ACS3~ACS0 bits in the ADCR0 register and ACS4 bit is the

ADCR1 register define the ADC input channel number. As the device contains only one actual

analog to digital converter hardware circuit, each of the individual 8 or 12 analog inputs must be

routed to the converter. It is the function of the ACS4~ACS0 bits to determine which analog channel

input pins or internal 1.25V is actually connected to the internal A/D converter.

The ACERH and ACERL control registers contain the ACER11~ACER0 bits which determine

which pins on Port A, PH0~PH3 are used as analog inputs for the A/D converter input and which

pins are not to be used as the A/D converter input. Setting the corresponding bit high will select the

A/D input function, clearing the bit to zero will select either the I/O or other pin-shared function.

When the pin is selected to be an A/D input, its original function whether it is an I/O or other pin-

shared function will be removed. In addition, any internal pull-high resistors connected to these pins

will be automatically removed if the pin is selected to be an A/D input.

HT67F60 Datasheet(PDF) 149 Page - Holtek Semiconductor Inc

HT67F60 Datasheet(HTML) 149 Page - Holtek Semiconductor Inc

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