The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

OTHER MODES OF THE 82558255 in Mode 1:

I/O With Handshaking Capability

‰One of the most powerful features of 8255 is to handle handshaking signals‰Handshaking refers to the process of two intelligent devices communicating back and forth
¾Example--printer
‰Mode 1: outputting data with handshaking signals
¾As show in Figure 15-14¾A and B can be used to send data to device with handshaking signals¾Handshaking signals are provided by port C¾Figure 15-15 provides a timing diagram