Low Power Cec Message Monitoring - Analog Devices ADV7610 Hardware User's Manual

Hardware User Guide

LOW POWER CEC MESSAGE MONITORING

The ADV7610 can be programmed to monitor the CEC line for messages that contain specific, user-programmable opcodes. These are
referred to as "WAKE_OPCODEs" as they allow the system to go into a low power or sleep mode and be woken up when an opcode of
interest is received, without the host processor having to check each received message.
The default values of the wake_opcode registers are detailed in this section. All of these registers can be overwritten as required by the
host processor.
For each of the 8 WAKE_OPCODE registers there is a corresponding raw flag, a status bit and a clear bit. If one of the WAKE_OPCODEs
is received, the corresponding raw flag will go high for a brief period of time. If the appropriate interrupt mask bit is set the status bit will
go high and remain high until cleared by the clear bit, and an interrupt will also be generated.
CEC_WAKE_OPCODE0[7:0], Addr 80 (CEC), Address 0x78[7:0]
CEC_WAKE_OPCODE0
This value can be set to a CEC opcode that requires a response. On receipt of this opcode, the Rx generates an interrupt that can be used
to alert the system that a CEC opcode of interest has been received and requires a response.
Function
CEC_WAKE_OPCODE0[7:0]
01101101 (default)
xxxxxxxx
CEC_WAKE_OPCODE1[7:0], Addr 80 (CEC), Address 0x79[7:0]
CEC_WAKE_OPCODE1
This value can be set to a CEC opcode that requires a response. On receipt of this opcode, the Rx generates an interrupt that can be used
to alert the system that a CEC opcode of interest has been received and requires a response.
Function
CEC_WAKE_OPCODE1[7:0]
10001111 (default)
xxxxxxxx
CEC_WAKE_OPCODE2[7:0], Addr 80 (CEC), Address 0x7A[7:0]
CEC_WAKE_OPCODE2
This value can be set to a CEC opcode that requires a response. On receipt of this opcode the Rx generates an interrupt that can be used
to alert the system that a CEC opcode of interest has been received and requires a response.
Function
CEC_WAKE_OPCODE2[7:0]
10000010 (default)
xxxxxxxx
CEC_WAKE_OPCODE3[7:0], Addr 80 (CEC), Address 0x7B[7:0]
CEC_WAKE_OPCODE3
This value can be set to a CEC opcode that requires a response. On receipt of this opcode, the Rx generates an interrupt that can be used
to alert the system that a CEC opcode of interest has been received and requires a response.
Function
CEC_WAKE_OPCODE3[7:0]
00000100 (default)
xxxxxxxx
Description
Power on
User specified OPCODE to respond to
Description
Give power status
User specified OPCODE to respond to
Description
Active source
User specified OPCODE to respond to
Description
Image view on
User specified OPCODE to respond to
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