參數(shù)資料
型號: MC908MR32CFUE
廠商: Freescale Semiconductor
文件頁數(shù): 229/282頁
文件大小: 0K
描述: IC MCU 8MHZ 32K FLASH 64-QFP
標(biāo)準(zhǔn)包裝: 84
系列: HC08
核心處理器: HC08
芯體尺寸: 8-位
速度: 8MHz
連通性: SCI,SPI
外圍設(shè)備: LVD,POR,PWM
輸入/輸出數(shù): 44
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 10x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-QFP
包裝: 托盤
產(chǎn)品目錄頁面: 726 (CN2011-ZH PDF)
Analog-to-Digital Converter (ADC)
MC68HC908MR32 MC68HC908MR16 Data Sheet, Rev. 6.1
50
Freescale Semiconductor
3.4 Interrupts
When the AIEN bit is set, the ADC module is capable of generating a CPU interrupt after each ADC
conversion. A CPU interrupt is generated if the COCO bit is at 0. The COCO bit is not used as a
conversion complete flag when interrupts are enabled.
3.5 Wait Mode
The WAIT instruction can put the MCU in low power-consumption standby mode.
The ADC continues normal operation during wait mode. Any enabled CPU interrupt request from the ADC
can bring the MCU out of wait mode. If the ADC is not required to bring the MCU out of wait mode, power
down the ADC by setting ADCH[4:0] in the ADC status and control register before executing the WAIT
instruction.
3.6 I/O Signals
The ADC module has 10 input signals that are shared with port B and port C.
3.6.1 ADC Analog Power Pin (VDDAD)
The ADC analog portion uses VDDAD as its power pin. Connect the VDDAD pin to the same voltage
potential as VDD. External filtering may be necessary to ensure clean VDDAD for good results.
NOTE
Route VDDAD carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
3.6.2 ADC Analog Ground Pin (VSSAD)
The ADC analog portion uses VSSAD as its ground pin. Connect the VSSAD pin to the same voltage
potential as VSS.
3.6.3 ADC Voltage Reference Pin (VREFH)
VREFH is the power supply for setting the reference voltage VREFH. Connect the VREFH pin to the same
voltage potential as
VDDAD. There will be a finite current associated with VREFH. See Chapter 19 Electrical
NOTE
Route VREFH carefully for maximum noise immunity and place bypass
capacitors as close as possible to the package.
3.6.4 ADC Voltage Reference Low Pin (VREFL)
VREFL is the lower reference supply for the ADC. Connect the VREFL pin to the same voltage potential as
VSSAD. A finite current will be associated with VREFL. See Chapter 19 Electrical Specifications.
NOTE
In the 56-pin shrink dual in-line package (SDIP), VREFL and VSSAD are tied
together.
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