RTD2260 参考原理图 两路AV输入，TTl数字信号输出-RTD2260 reference schematic

使用AD7120将TTL信号转换成VGA信号的方案原理图-Using the AD7120 to TTL signals into VGA signal program schematic

Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 3 output buffers can sink/source four TTL inputs. When 1s are written to Port 3 pins they are pulled high by the internal pull-ups and can be used as inputs. As inputs, P