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PIP CONTROL CIRCUIT
The AVM-2780G provides for Picture In Picture (PIP) function through
IC8001, the PIP Signal Processor IC.
The PIP circuits perform PIP On/Off, PIP Swap, PIP Location, PIP Freeze and
PIP Select functions.
The PIP functions are operated using the remote control transmitter.
The PIP circuits are controlled by the PIP Signal Processor IC8001 through
the CPU IC801. The PIP Signal Processor IC8001 requires 6 inputs: the
CPU, the horizontal and vertical sync circuits, the PIP sync separation circuit
and the PIP 3.3 VDC supply circuit. There are two inputs from CPU; the SDA
(Serial Data) input/output from pin 32, and the SCL (Serial Clock) input from
pin 34. The Data signals control the PIP On/Off, the PIP Swap, PIP Location,
PIP Freeze and PIP Select functions. When the power is switched On, the 12
VDC and PIP 3.3 VDC supply lines will gradually rise. At 60ms after pin 27 of
the CPU goes High, IC8001 will execute a Power On Reset, initializing all
internal registers to 0 (zero) and resetting the BUS interface.
60ms
5V
0V
H
L
(POWER:OFF
➔
ON)
PIP Power On Reset
PIP Control Data Signals (BUS Data Transfer)
POWER ON
160ms
(POWER ON RESET)
MSB
1
2
7
8
9
MSB
1
2
7
8
9
ACK
ACK
Start
Condition
Stop
Condition
S
IC Address
Data Byte
Sub Address = auto-increments
A = Acknowledge bit
S = Start bit
P = Stop bit
0
Sub Address
n Bytes
IC Address = 24 hex (00100100)
IC8001
CPU
CPU
CPU
A
A
A P
(BUS SDA)
(BUS SCL)
(ACK)
IC8001
