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The first four bytes, Base+0 through Base+3, of address space on the MPA-200
contain the internal registers of the SCC. The next two locations Base+4 and
Base+5 contain the communications register and the configuration register. The
last two address port locations are reserved for future use. The entire address
range of the MPA-200 is shown in Table 12.
Table 12 MPA-200 Address Assignments
ReservedBase + 7
ReservedBase + 6
Configuration RegisterBase + 5
Communications RegisterBase + 4
SCC Control Port, Channel BBase + 3
SCC Data Port, Channel BBase + 2
SCC Control Port, Channel ABase + 1
SCC Data Port, Channel ABase + 0
Register DescriptionAddress
Information on the internal registers of the SCC can be found in the chapter titled
SCC GENERAL INFORMATION starting on page 4. The two onboard registers
give the user additional options pertaining to DMA, and Interrupts. Information on
the configuration register and the communications register can be found in the
chapters CONFIGURATION REGISTER on page 21, and COMMUNICATIONS
REGISTER on page 23.
Quatech Inc., MPA-200/300 Manual 16