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更新时间: 2024-11-10 23:58:47
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其他 - ETC /
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2页 18K
描述
EM56/57 - Speech & Music Synthesizer - Application Note - Application Note

IR 数据手册

 浏览型号IR的Datasheet PDF文件第2页 
TITLE:  
How to Implement Infrared function with EM57000 series ?  
REVISED DATE  
: 13, JUNE, 1998  
REVISED VERSION : 1.0  
APPLY TO CHIPS : EM57000 Series Chip (Except EM57001,EM57400)  
APPLY TO SOFTWARE : ALLEM57000seriescodingsystemaboveversion2.1  
SEE ALSO:  
ꢀ ꢀ ꢀ ꢀ  
1. EM57000 series contain infrared function ( EM57001 and EM57400  
don't have infrared function ) which can generate 38K Hz  
square wave to ouside world from port 3.2 whenever it needs.  
2. To activate infrared function, programmer should control bit 2,  
bit3 and bit4 of mode register :  
When bit4,3,2 of mode register is "101", infrared function will  
be activated.  
When bit4,3,2 of mode register is "000", infrared function will  
be disabled.  
MODE = 101?B => Enable infrared function.  
MODE = 000?B => Disable infrared function.  
Note that for bit 0 of mode register we mark it as ? means this  
bit can be "1" or "0". This bit have no relation with infrared  
function.  
bit 0 of MODE register can be used to enable/disable flash with  
volume.  
3. User will need to enable port 3.2 by seting bit 2 of P3S as "0"  
so that 38K Hz square wave can send to outside world. But status  
of Port 3.2 can be "1" or "0"  
4. Following is a simple example, it show you how to implement infrared  
function :  
MOV A, #0000B ; Enable port 3.2  
MOV P3S A  
MOV A, #0100B ; Initial status of port 3.2 is "1"  
MOV P3 A  
SIGN1:  
MOV A #1010B ; Send out 38 K Hz square  
MOV MODE A  

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