The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

Figure 15-6. 8051 Connection to the 8255 for Example 15-4

PROGRAMMING THE 8255Address Aliases

(cont’)

74LS373

AD7 AD0

8255

A1A0 D7 D0

G D Q

RD WR OC

A7A6A5A4A3A2

P3.7P3.6 ALE P0.7 P0.0

CS A1A0 D7

WRRD PA PB PCL PCU RESD0