參數(shù)資料
型號: MC68HC11F1CPU4
廠商: Freescale Semiconductor
文件頁數(shù): 30/158頁
文件大?。?/td> 0K
描述: IC MCU 512 EEPROM 4MHZ 80-LQFP
標準包裝: 90
系列: HC11
核心處理器: HC11
芯體尺寸: 8-位
速度: 4MHz
連通性: SCI,SPI
外圍設備: POR,WDT
輸入/輸出數(shù): 30
程序存儲器類型: ROMless
EEPROM 大?。?/td> 512 x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 4.75 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-LQFP
包裝: 托盤
ANALOG-TO-DIGITAL CONVERTER
TECHNICAL DATA
10-1
SECTION 10 ANALOG-TO-DIGITAL CONVERTER
The analog-to-digital (A/D) system, a successive approximation converter, uses an all-
capacitive charge redistribution technique to convert analog signals to digital values.
10.1 Overview
The A/D system is an 8-channel, 8-bit, multiplexed-input converter. The AVDD pin is
used to input supply voltage to the A/D converter. This allows the supply voltage to be
bypassed independently. The converter does not require external sample and hold cir-
cuits because of the type of charge redistribution technique used. A/D converter timing
can be synchronized to the system E clock, or to an internal resistor capacitor (RC)
oscillator. The A/D converter system consists of four functional blocks: multiplexer, an-
alog converter, digital control, and result storage. Refer to Figure 10-1.
10.1.1 Multiplexer
The multiplexer selects one of 16 inputs for conversion. Input selection is controlled by
the value of bits CD–CA in the ADCTL register. The eight port E pins are fixed-direc-
tion analog inputs to the multiplexer, and internal analog signal lines are routed to it.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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