8. (a) In the Normal Expanded Wide mode or the Normal Expanded Narrow mode, the MC9S12DP256B microcontroller can fetch external RAM memory over the address range of 4000H through FFFFH. From what ports does the microcontroller send out the 16-bit address of the RAM memory it is trying to access?
(b) What control signals does the microcontroller send out when it is trying to read from this external memory? Provide the names of these signals and tell where they come from (which pins of which ports). (Assume that the microcontroller is using the Normal Expanded Wide mode for this part of the problem.)
(b) Indicate the logic value of the signals of part (b) for a "memory read" operation. (Hint: One of these signals starts out as a 0, then changes to a 1.)
(c) Referring to part (b), how does the answer change in the operation is "memory write" instead of "memory read."