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MC68HC11P1CFN3 参数 Datasheet PDF下载

MC68HC11P1CFN3图片预览
型号: MC68HC11P1CFN3
PDF下载: 下载PDF文件 查看货源
内容描述: 微控制器 [Microcontrollers]
分类和应用: 微控制器
文件页数/大小: 268 页 / 2323 K
品牌: FREESCALE [ Freescale ]
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Freescale Semiconductor, Inc.  
Analog-to-Digital Converter  
9.5 Channel assignments  
The multiplexer allows the A/D converter to select one of sixteen analog  
signals. Eight of these channels correspond to port E input lines to the  
MCU, four others are internal reference points or test functions; the  
remaining four channels are reserved. Refer to Table 9-1.  
Table 9-1. A/D converter channel assignments  
Channel  
number  
Channel  
signal  
Result in ADRx  
if MULT = 1  
1
AN0  
AN1  
ADR1  
ADR2  
ADR3  
ADR4  
ADR1  
ADR2  
ADR3  
ADR4  
2
3
AN2  
4
AN3  
5
6
AN4  
AN5  
7
AN6  
8
AN7  
9–12  
reserved  
(1)  
13  
14  
15  
16  
ADR1  
ADR2  
ADR3  
ADR4  
VRH  
*
VRL  
V
RH/2*  
reserved*  
1. Used for factory testing.  
9.5.1 Single-channel operation  
There are two types of single-channel operation. In the first type (SCAN  
= 0), the single selected channel is converted four consecutive times.  
The first result is stored in A/D result register 1 (ADR1), and the fourth  
result is stored in ADR4. After the fourth conversion is complete, all  
conversion activity is halted until a new conversion command is written  
to the ADCTL register. In the second type of single-channel operation  
(SCAN = 1), conversions continue to be performed on the selected  
channel with the fifth conversion being stored in register ADR1  
(overwriting the first conversion result), the sixth conversion overwriting  
Technical Data  
MC68HC11P2 — Rev 1.0  
Analog-to-Digital Converter  
For More Information On This Product,  
Go to: www.freescale.com  
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