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| 型號(hào)： | MC68HC05E6CDW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | PLASTIC, SOIC-28 |
| 文件頁(yè)數(shù)： | 104/140頁(yè) |
| 文件大小： | 1584K |
| 代理商： | MC68HC05E6CDW |
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A-to-D Converter
MC68HC05E6 — Rev. 1.0
A-to-D Converter
The A/D converter can operate from either the bus clock or an internal
RC type oscillator. The internal RC type oscillator is activated by the
ADRC bit in the A/D status/control register (ADSTAT) and can be used
to give a sufficiently high clock rate to the A/D converter when the bus
speed is too low to provide accurate results (see A/D status/control
register (ADSTAT)). When the A/D converter is not being used it can be
disconnected using the ADON bit in the ADSTAT register, in order to
save power (see A/D status/control register (ADSTAT)).
A/D converter operation
The A/D converter consists of an analog multiplexer, an 8-bit
digital-to-analog capacitor array, a comparator and a successive
approximation register (SAR). See A/D converter block diagram.
There are four A/D input options that can be selected by the multiplexer:
AD0/PG0, AD1/PG1, AD2/PG2 or AD3/PG3. Selection is made via the
CHx bits in the ADSTAT register (see A/D status/control register
(ADSTAT)). These bits can also be used to select one of the internal test
channels.
The A/D reference input (AD0–AD3) is applied to a precision internal
digital-to-analog converter. Control logic drives this D/A converter and
the analog output is successively compared with the analog input
sampled at the beginning of the conversion. The conversion is
monotonic with no missing codes.
The result of each successive comparison is stored in the SAR and,
when the conversion is complete, the contents of the SAR are
transferred to the read-only result data register ($10), and the
conversion complete flag, COCO, is set in the A/D status/control register
($11).
NOTE:
Any write to the A/D status/control register will abort the current
conversion, reset the conversion complete flag and start a new
conversion on the selected channel.
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For More Information On This Product,
Go to: www.freescale.com
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| MC68HC705E6MFB | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC705E6CFB | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC68HC05E6CFB | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6DW | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6FB | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6MDW | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
| MC68HC05E6MFB | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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