ST72T774J9B1 STMicroelectronics, ST72T774J9B1 Datasheet - Page 60

• Manufacturer Part Number: ST72T774J9B1
• Manufacturer: STMicroelectronics

Specifications of ST72T774J9B1

• Cpu Family: ST7
• Device Core Size: 8b
• Frequency (max): 24MHz
• Interface Type: I2C/USB
• Program Memory Type: EPROM
• Program Memory Size: 60KB
• Total Internal Ram Size: 1KB
• # I/os (max): 31
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4V
• On-chip Adc: 1-chx8-bit
• On-chip Dac: 1-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 42
• Package Type: SPDIP
• Lead Free Status / Rohs Status: Specific Sites Compliant

ST72774/ST727754/ST72734
Figure 41. Moire Output (instead of Clamping Output)
4.4.5.1 Blanking output signal
The Video Blanking function uses VSYNCO,
HFBACK,
BLANKOUT output as Video Blanking Output. This
output pin is a 5V open-drain output and can be
AND-wired with any external video blanking signal.
Note: HFBACK, VFBACK, VSYNCO signals must have
Figure 42. Video Blanking Stage Simplified Schematic
60/144
VFBACK
Moire
HFBACK
HFBACK
VFBACK
VSYNCO
positive polarity.
VFBACK
as
input
To Edge detector (LATR)
To Edge detector (LATR)
signals
R
S
and
To use the video blanking signal:
– Program the polarity:
– Enable the BLANKOUT output:
BLKINV bit in POLR register
BLKEN bit in ENR register
BLKINV
BLKEN
BLANKOUT