8085 Bus Structure Include the following bus 

Address Bus :

  • Consists of 16 address lines: A0 – A15

  • Address locations: 0000 (hex) – FFFF (hex)

  • Can access 64K ( = 216 ) bytes of memory, each byte has 8 bits

  • Can access 64K × 8 bits of memory

  • Use memory to map I/O, Same instructions to use for

  • accessing I/O devices and memory

Data Bus :

  • Consists of 8 data lines: D0 – D7

  • Operates in bidirectional mode

  • The data bits are sent from the MPU to I/O & vice versa

  • Data range: 00 (hex) – FF (hex)

Control Bus:

  • Consists of various lines carrying the control signals such as read / write enable, flag bits.