6502 CPU's Read/Write Question

["Bryan Parkoff" <nospam@nospam.com>]

    6502 CPU has R/W pin.  Is it possible that all instructions are always
set to read only unless R/W pin is turned on to tell some instructions to
set to write only.  It uses STA instruction for read first then write.

For example:
Cycle 1: Address Bus: 1000  Data Bus: 8D -- Read only
Cycle 2: Address Bus: 1001  Data Bus: 01 -- Read only
Cycle 3: Address Bus: 1002  Data Bus: 20 -- Read only
Cycle 4: Address Bus: 2001  Data Bus: C1 -- Read only (Old Data)
Cycle 4: Turn on R/W pin  -- Read $41 from Accumulator
Cycle 4: Address Bus: 2001  Data Bus: 41 (New Data)

    It is like ASL using RMW.  What do you think?

Bryan Parkoff