MT312 Zarlink Semiconductor, MT312 Datasheet - Page 78

• Manufacturer Part Number: MT312
• Description: Satellite Channel Decoder
• Manufacturer: Zarlink Semiconductor

12.5
KEY:
Write operation - as a slave receiver:
Read operation - MT312 as a slave transmitter:
Write/read operation with repeated start - MT312 as a slave transmitter:
Write/read/write operation with repeated start and auto increment off with IAI set high - MT312 as a slave
transmitter. This example uses the GPP_CTRL register where the register address is 20 + 128 (IAI). Data are first
read from the GPP_CTRL register, then following a restart, data are written to the GPP_CTRL register.
To program the Tuner, use the following sequence of three messages:
Open secondary 2-wire port:
Program Tuner:
Close secondary 2-wire port:
Always close the secondary 2-wire port after programming the Tuner, to avoid 2-wire bus clock interference in the
Tuner.
S
S
S
S
S
S
S
ADDRESS
DEVICE
ADDRESS
ADDRESS
Examples of 2-wire Bus Messages
DEVICE
TUNER
ADDRESS
DEVICE
ADDRESS
ADDRESS
DEVICE
MT312
ADDRESS
MT312
W A RADD
S
P
A
RADD
W
W
R
(148)
A
W
A
A
W
RADD
A S
(BYTE 2)
(n)
A
DATA
Start condition
Stop condition
Acknowledge
Register Address
DATA (reg 0)
W
A
ADDRESS
DEVICE
A
A
RADD
Zarlink Semiconductor Inc.
(n)
GPP_CTRL
S
A
(20)
MT312
ADDRESS
R A
(BYTE 3)
DEVICE
A
GPP_CTRL
DATA
78
W
R
NA
ITALICS
A
(20)
(reg 20)
DATA (reg 1)
DATA
A
A
R
(reg n)
DATA
Write (= 0)
Read (= 1)
NOT Acknowledge
MT312 output
NA S
A
(BYTE 4)
DATA
(64)
DATA
A
(reg n)
DATA
ADDRESS
A
DEVICE
A
DATA (reg 2)
DATA
A
A
(0)
A
(reg n+1)
DATA
W A
P
reg n+1)
(BYTE 5)
DATA
DATA
Design Manual
A
(reg 20)
DATA
A
NA
NA
P
A
A P
P
P
P
P