HT66F13 datasheet(110/173 Pages) HOLTEK

110 / 173 page

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 register as

shown in the accompanying table. D0~D11 are the A/D conversion result data bits. Any unused bits

will be read as zero.

ADRFS

ADRH

ADRL

7654321076543210

D11

D10

0000

D11

D10

A/D Data Registers

A/D Converter Control Registers

- ADCR0, ADCR1, ACER

To control the function and operation of the A/D converter, three control registers known as ADCR0,

ADCR1 and ACER 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 ACS1~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 4 analog inputs must be routed to the converter. It is the

function of the ACS4 and ACS1~ACS0 bits to determine which analog channel input pins or internal

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

The ACER control register contains the ACER3~ACER0 bits which determine which pins on

PA0~PA3 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.

HT66F13/HT66F14/HT66F15

Enhanced A/D Flash Type MCU

Rev. 1.10

110

February 9, 2011

HT66F13 Datasheet(PDF) 110 Page - Holtek Semiconductor Inc

HT66F13 Datasheet(HTML) 110 Page - Holtek Semiconductor Inc

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