參數(shù)資料
型號: MC68HC05JB4DWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 134/134頁
文件大小: 1305K
代理商: MC68HC05JB4DWR2
February 24, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05JB4
ANALOG TO DIGITAL CONVERTER
MOTOROLA
REV 2
11-1
SECTION 11
ANALOG TO DIGITAL CONVERTER
The analog to digital converter system consists of a single 8-bit successive
approximation converter and an 16-channel analog multiplexer. Six of the chan-
nels are available for analog inputs, four channels are dedicated to internal test
functions, and the remaining six channels are unused. There is one 8-bit ADC
Data Register ($0F) and one 8-bit ADC Status and Control register ($0E). The ref-
erence supply, VRL and VRH for the converter uses two input pins (shared with port
pins PC4 and PC5) instead of the power supply lines, because drops caused by
loading in the power supply lines would degrade the accuracy of the analog to dig-
ital conversion. An internal RC oscillator is available if the bus speed is low
enough to degrade the ADC accuracy. An ADON bit allows the ADC to be
switched off to reduce power consumption, which is particularly useful in the Wait
mode.
Figure 11-1. ADC Converter Block Diagram
CH3
CH2
CH1
CH0
COCO
ADRC
ADON
8-bit capacitive DAC
with sample and hold
Successive approximation
register and control
Result
ADC Status and Control Register ($0E)
Analog
MUX
(Channel
assignment)
ADC Data Register ($0F)
VRH
VRL
AD0
VRH
(VRH+VRL)/2
VRL
AD1
AD2
AD3
(VRH+VRL)/4
8
AD4
AD5
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