STV6889 datasheet(29/56 Pages) STMICROELECTRONICS

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STV6889

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Read-out flags

SadXX/D0 - VDet(59)

Flag indicating Detection of V synchronization

pulses on VSyn pin.

0: Not detected

1: Detected

SadXX/D1 - HVDet (59)

Flag indicating Detection of H or HV synchroni-

zation pulses applied on H/HVSyn pin. Once the

sync pulses are detected, the flag is set and

latched. Disappearance of the sync signal will

not lead to reset of the flag.

0: Not detected

1: Detected.

SadXX/D2 - VExtrDet (59)

Flag indicating Detection of Extracted Vertical

synchronization signal from composite H+V sig-

nal applied on H/HVSyn pin.

0: Not detected

1: Detected

SadXX/D3 - VPol

Flag indicating Polarity of V synchronization

pulses applied on VSyn pin with respect to mean

level of the sync signal.

0: Positive

1: Negative

SadXX/D4 - HVPol

Flag indicating Polarity of H or HV synchroniza-

tion pulses applied on H/HVSyn pin with respect

to mean level of the sync signal.

0: Positive

1: Negative

SadXX/D5 - XRayAlarm

Alarm indicating that an event of excessive volt-

age has passed on XRay pin. Can only be reset

to 0 through I²C-bus bit XRayReset or by power-

on reset.

0: No excess since last reset of the bit

1: At least one event of excess appeared

since the last reset of the bit, HOut inhibited

SadXX/D6 - VLock

Status of “Locking” or stabilizing of Vertical oscil-

lator amplitude to an internal reference by AGC

regulation loop.

0: Locked (amplitude stabilized)

1: Not locked (amplitude non-stabilized)

SadXX/D7 - HLock

Lock status of Horizontal PLL1.

0: Locked

1: Not locked

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