MT312C ZARLINK [Zarlink Semiconductor Inc], MT312C Datasheet - Page 76

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

MT312
11.5 Examples of 2-Wire Bus Messages
KEY:
ITALICS
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 is first
read from the GPP CTRL register, then following a restart, data is 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.
76
S
S
S
S
S
S
S
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
ADDRESS
DEVICE
DEVICE
DEVICE
DEVICE
TUNER
MT312
MT312
S
P
A
W A
Microprocessor Control
W
W
W
W
W
R
Start condition
Stop condition
Acknowledge
MT312 output
A
A
A
A
A
A
RADD
GPP CTRL
GPP CTRL
(148)
(BYTE 2)
(reg 0)
RADD
RADD
DATA
DATA
(20)
(20)
(n)
(n)
A
A
A
A
A
A
A
S
S
ADDRESS
W
R
NA
RADD
(BYTE 3)
DEVICE
(reg n)
(reg 1)
DATA
DATA
DATA
DATA
DATA
(64)
(0)
ADDRESS
DEVICE
Write (= 0)
Read (= 1)
NOT Acknowledge
Register Address
R
A
A
A
A
A
A
R
(reg n+1)
(BYTE 4)
(reg 2)
DATA
DATA
DATA
(reg 20)
A
P
P
DATA
(reg n)
DATA
NA P
A
A
NA S
P
(BYTE 5)
DATA
A
ADDRESS
DEVICE
(reg n+1)
DATA
A
W A
P
NA
(reg 20)
DATA
P
A
P