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MT312C 参数 Datasheet PDF下载

MT312C图片预览
型号: MT312C
PDF下载: 下载PDF文件 查看货源
内容描述: 卫星频道解码器 [Satellite Channel Decoder]
分类和应用: 解码器
文件页数/大小: 90 页 / 315 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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MT312 DiSEqC Control  
5.2 DiSEqC Control Read/Write Registers  
5.2.1 DiSEqC™ Mode Control. Register 22 (R/W)  
Def  
hex  
NAME  
ADR  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
DISEQC MODE  
22  
Reserved  
HV  
DISEQC  
22kHz mode  
R/W  
00  
instruction length  
B7:  
Reserved.  
Must be set low.  
B6:  
HV H/V polarisation control: High = Horizontal, DISEQC[1] pin = high  
Low = Vertical, DISEQC[1] pin = low  
The DISEQC[1] pin controls the externally generated 13/18V LNB voltage.  
B5-3:  
B2-0:  
Number of bytes in DiSEqCinstruction minus 1, to output on DISEQC[0] pin.  
i.e. if the message contains four bytes, program B5-3 with the value three.  
DiSEqCmode:  
0:  
22kHz off  
1:  
22kHz on continuous  
2:  
Burst mode - on for 12.5ms = '0'  
Burst mode - modulated 1:2 for 12.5ms = '1'  
Modulated with bytes from DISEQC INSTR  
Reserved.  
3:  
4:  
5-7:  
Note:  
for modes 2 and 3, an interrupt is generated 16ms after the '0' or '1' burst.  
for mode 4, there is a 16ms delay before the message bytes, then an interrupt is generated 16ms after  
the last message byte has been sent. The requisite number of bytes must be pre-loaded into  
DISEQC INSTR (register 36) before this bit is set, see 31.  
5.2.2 DiSEqC(tm) Ratio. Register 35 (R/W)  
Def  
hex  
NAME  
ADR  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
DISEQC RATIO  
35  
DISEQC RATIO[7:0]  
R/W  
00  
DISEQC RATIO[7:0] This must be programmed to set the Diseqc output tone frequency.  
F
=
F
out  
xtal  
4*DISEQC_RATIO[7:0]  
Where F is in kHz and F  
is in MHz.  
xtal  
out  
For a 22kHz output tone, DISEQC RATIO[7:0] = 11.364 * F  
xtal  
e.g. with F  
= 10MHz, DISEQC RATIO[7:0] = 114, or for 15 MHz 170.  
xtal  
30  
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