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HT98R068-1 数据表(PDF) 56 Page - Holtek Semiconductor Inc

部件名 HT98R068-1
功能描述  Two Way Radio 8-Bit MCU
Download  116 Pages
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制造商  HOLTEK [Holtek Semiconductor Inc]
网页  http://www.holtek.com
标志 HOLTEK - Holtek Semiconductor Inc

HT98R068-1 数据表(HTML) 56 Page - Holtek Semiconductor Inc

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HT98R068-1
Two Way Radio 8-Bit MCU
HT98R068-1
Two Way Radio 8-Bit MCU
Analog to Digital Converter
The need to interface to real world analog signals is a common requirement for many electronic
systems. However, to properly process these signals by a microcontroller, they must first be
converted into digital signals by A/D converters. By integrating the A/D conversion electronic
circuitry into the microcontroller, the need for external components is reduced significantly with the
corresponding follow-on benefits of lower costs and reduced component space requirements.
A/D Overview
The device contains an 8-channel analog to digital converter which can directly interface to external
analog signals, such as that from sensors or other control signals and convert these signals directly
into either a 12-bit digital value.
Input Channels
Conversion Bits
Input Pins
8
1�
PA0~PA�
PC0~PC�
The accompanying block diagram shows the overall internal structure of the A/D converter, together
with its associated registers.
A/D Converter Data Registers – ADRL, ADRH
The device, which has an internal 12-bit A/D converter, requires two data registers, 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. Only the high byte register, ADRH, utilises its full 8-bit contents. The low
byte register utilises only 4 bit of its 8-bit contents as it contains only the lowest bits of the 12-bit
converted value.
In the following table, D0~D11 is the A/D conversion data result bits.
Register
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
ADRL
D�
D�
D1
D0
ADRH
D11
D10
D9
D8
D7
D6
D5
D4
A/D Data Registers
A/D Converter Control Registers – ADCR, ACSR, ANCSR
To control the function and operation of the A/D converter, four control registers known as ADCR,
ACSR and ANCSR are provided. These 8-bit registers define functions such as the selection of
which analog channel is connected to the internal A/D converter, which pins are used as analog
inputs and which are used as normal I/Os, 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 ADCR register define the channel number. As the device contains only
one actual analog to digital converter circuit, each of the individual 8 analog inputs must be routed
to the converter. It is the function of the ACS3~ACS0 bits in the ADCR register to determine which
analog channel is actually connected to the internal A/D converter.
The control register, ANCSR, determines which pins on PA0~PA3, PC0~PC3 are used as analog
inputs for the A/D converter and which pins are to be used as normal I/O pins. If the 8-bit address
on PCR7~PCR0 has a value of “FFH”, then all 8 pins, namely AN0~AN7 will all be set as analog
inputs. To reduce the power consumption in normal run, the ADC module can be turned off by
setting ADONB=1 in ACSR. Once the ADC module is turned off, the ADC module and analog


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