MT312C ZARLINK [Zarlink Semiconductor Inc], MT312C Datasheet - Page 30

• Manufacturer Part Number: MT312C
• Description: Satellite Channel Decoder
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

MT312
5.2 DiSEqC Control Read/Write Registers
5.2.1 DiSEqC™ Mode Control. Register 22 (R/W)
B7:
B6:
B5-3:
B2-0:
Note:
5.2.2 DiSEqC(tm) Ratio. Register 35 (R/W)
DISEQC RATIO[7:0] This must be programmed to set the Diseqc output tone frequency.
F
Where F
For a 22kHz output tone, DISEQC RATIO[7:0] = 11.364 * F
e.g. with F
30
DISEQC MODE
DISEQC RATIO
out
=
NAME
NAME
4*DISEQC_RATIO[7:0]
out
Reserved.
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.
Number of bytes in DiSEqC™ instruction minus 1, to output on DISEQC[0] pin.
i.e. if the message contains four bytes, program B5-3 with the value three.
DiSEqC™ mode:
0:
1:
2:
3:
4:
5-7:
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.
xtal
is in kHz and F
= 10MHz, DISEQC RATIO[7:0] = 114, or for 15 MHz 170.
DiSEqC Control
F
xtal
ADR
ADR
22
35
Must be set low.
22kHz off
22kHz on continuous
Burst mode - on for 12.5ms = '0'
Burst mode - modulated 1:2 for 12.5ms = '1'
Modulated with bytes from DISEQC INSTR
Reserved.
xtal
Reserved
is in MHz.
B7
B7
HV
B6
B6
B5
B5
DISEQC RATIO[7:0]
instruction length
DISEQC
B4
B4
xtal
B3
B3
B2
B2
22kHz mode
B1
B1
B0
B0
R/W
R/W
Def
hex
Def
hex
00
00