STV2050A datasheet(64/83 Pages) STMICROELECTRONICS

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STV2050A - IC STATUS REGISTERS

– Wait until the HSYNC and VSYNC signals are available on pins 27 and 28 respectively. (At

least 2 VSYNC pulses are required). If one signal is missing, the STV2050A remains in

Stand-by mode.

– Use the I²C master to read the EEPROMadd[2:0] data bits in the EEPROM having the hard-

ware address 010 (bin). The EEPROMadd[2:0] bits represent the address of the EEPROM

which will be used to setup the STV2050A during the boot sequence,

Note: This is particularly suitable when it is necessary to recover the last configuration used before switch-

ing off for example.

– Use the I²C master to download all convergence data and registers (from the selected EEP-

ROM, as explained before),

– Wait for up to 2 fields after all the data has been downloaded and enable the outputs.

16 IC STATUS REGISTERS

Some registers of the STV2050A can be read via the I²C slave bus in order to indicate the up-

dated status of the IC. The update is enabled using the RUE bit in the EF register.

The update timing of registers D0 to D3 is determined by the RU1 bit in the EF register.

The update timing of the E4 register is determined by the RU2 bit in the EF register.

The S01 bit in the E3 or E4 or E5 or E9 registers:

– Power-on reset status

The S02 bit in the E3 register:

– Security output (POUT) status

RUE

No update

Update enabled

RU1

No update

Update after vertical reset

RU2

No update

Update after vertical reset

S01

Reset successfully achieved

Reset ongoing

S02

“0” (pull down to ground)

High impedance

STV2050A датащи(PDF) 64 Page - STMicroelectronics