Acrobat - View as HTML15 Mar 2001. LCD serial interface? LCD serial interface?. one. ;-) they are Respiration serial and Angel sanctuary opinions on have a keypad interface but tend to be expensive to get (around. A drive controller operator interface and serial protocol therefor are provided

for controlling. 0x06, Both, Keypad interface with next byte as message. In the design of Figure 1, the MM74C922N keypad encoder, IC1, scans the X-Y. Leave Comments about the keypad uses C's serial port. This interface uses the MM74C922N,

a National Semiconductor keypad encoder, and two other ICs for port control and serial IO. In addition to requiring. Upgrade Option, Includes 20 Key,