IA80C152_10 Datasheet, PDF (23/61 Pages) InnovASIC, Inc – Universal Communications Controller

IA80C152
Universal Communications Controller
Data Sheet
July 29, 2010
4.2 Memory Space
Memory space is divided up into program and data memory. Program memory is all external to
the IA80C152. Data memory is divided up into external and internal data memory. There can
be up to 64K bytes of external program and data memory. Internal data memory is 256 bytes
that is mapped between RAM, SFRs, and Register Banks. Figure 5 diagrams the organization of
the IA80C152 memory space. See the C8051 section for further details.
Program memory is accessed using control signals and ports. On the JA and JC versions of the
IA80C152 this access is performed through ports P0 and P2. Further, because there is no
internal ROM, the entire program memory space is accessed via ports P0 and P2. On the JB and
JD version of the IA80C152, program memory access can be through either ports P0 and P2, or
ports P5 and P6. Which set of ports program memory fetches are made through is controlled by
the input signals EAn and EBEN. Table 10 summarizes the IA80C152 versions and the
relationship to program memory fetches.
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