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ST7FLCD1 Datasheet(PDF) 63 Page - STMicroelectronics

No. de pieza ST7FLCD1
Descripción Electrónicos  8-bit MCU for LCD Monitors with 60 KBytes Flash,2 KBytes RAM, 2 DDC Ports and Infrared Controller
PDF  95 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7FLCD1 Datasheet(HTML) 63 Page - STMicroelectronics

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ST7FLCD1
Display Data Channel Interfaces (DDC)
EDID DMA Pointer Configuration).
11.4.2 Mode Description
DDC2B Mode: The DDC2B Interface enters DDC2B mode from the initial state if the software sets
the HWPE bit. Once in DDC2B mode, the Interface always acts as a slave following the protocol
described in Figure 34.
The DDC2B Interface continuously monitors the SDA and SCL lines for a START condition and will
not respond (no acknowledge) until one is found.
A STOP condition at the end of a Read command (after a NACK) forces the stand-by state. A STOP
condition at the end of a Write command triggers the internal DMA write cycle.
The Interface samples the SDA line on the rising edge of the SCL signal and outputs data on the
falling edge of the SCL signal. In any case, the SDA line can only change when the SCL line is low.
EDID Data structure mapping: An internal address pointer defines the memory location being
addressed.
Figure 34: DDC2B Protocol Example
Figure 35: DDC1/2B Operation Flowchart
SDA
SCL
Start
Ack
A0h
Device Slave
00h
Data Address
Ack
Start A1h
Data1
Ack
DataN
Nack
Stop
Stop
Address
Device Slave
Address
128 / 256 bytes EDID
Legend:
Italics = data / control signal from display
Ack
Bold = data / control signal from host
Wait for HWPE = 1
HWPE bit = 0
Received valid
Device Address?
N
Respond to Command
Send Acknowledge
Y
DMA Low Pointer Address = 0



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