SPRUIW9C October 2021 – March 2024 TMS320F280033 , TMS320F280034 , TMS320F280034-Q1 , TMS320F280036-Q1 , TMS320F280036C-Q1 , TMS320F280037 , TMS320F280037-Q1 , TMS320F280037C , TMS320F280037C-Q1 , TMS320F280038-Q1 , TMS320F280038C-Q1 , TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1
In Direct Access Mode, the external host through the HIC can directly read from and write to device locations specified in the memory map. The device location to read is a combination of the 8-bit address lines A[7:0] and the 24-bit HICDBADDR{#} register.
These two address pieces are concatenated as:
Full 32-bit Address = {HICDBADDR{#}.BASE_ADDR[31:8},A[7:0]}
There are 8 HICDBADDR{#} registers for a total of 2048 address locations in combination with A[7:0] address lines. Which HICDBADDR{#} register to concatenate with A[7:0] is selectable by the HICBASESEL register or BASESEL[2:0] pins. Figure 14-7 shows the Direct Access Mode and the minimum external connections required for this mode.