hi,

I think it is useless to calculate the number of memory spaces because in fact of matter this question depends on conditions by which we do it. For example, I may say that there are next memories there:
- RAM;
- FLASH (most parts);
- ROM (bootloader - some parts);
- EEPROM (some parts).
...and I am right if we talk about physical memory realization.

If we talk about memory access modes so the answer is different:
- direct (DATA, BITs, SFRs);
- indirect (IDATA, XDATA, CODE);
- sequental (stack area, buffers with one-SFR entrance like CAN buffers inside (A)T89C51CC01/02/03, FIFO UARTs, etc);
- hidden: presents but may not be accessed (interrupts priority stack, registers TMP1, TMP2, hardware protect and configuration bits, etc).

And so what I wish to say - ask correct question if need with correct answer, yeah?

Regards,
Oleg