ST72T774J9B1 STMicroelectronics, ST72T774J9B1 Datasheet - Page 103

• 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

Figure 63. DDC1/2B Operation Flowchart
N
Relative Address (ALR) = 0
N
Vsync Counter += 1
or Timer expired ?
Wait for HWPE = 1
Vsync Counter = 0
Device Address?
Start 2-sec Timer
Received valid
Counter = 128
SDA Hi-Z
CF2 = 0 ?
N
N
Y
Y
CF0 = 0
N
Vsync
Vsync
SCL
SCL
and
Y
Y
Y
N
N
Y
Y
HWPE bit = 0
Re-Start 2-sec Timer
Vsync Counter = 0
Send Next Bit
Relative Address (ALR) = 0
Respond to Command
Device Address?
Send Acknowledge
ST72774/ST727754/ST72734
Received valid
Y
N
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