TMS320C25 Direct Addressing Mode
--------------------------------

Instruction bits
Op-Code  Address
-------- --------
xxxxxxxx 0AAAAAAA	Direct memory address -- AAAAAAA is the address 0..7F

			The address is formed from the Data Page register
			and the address bits of the instruction.

			The data page register points to one of 512 pages of
			128 words each.  The address bits point to the word
			in the page.

TMS320C25 Indirect Addressing Mode
----------------------------------

Instruction bits
Op-Code  Address
-------- --------
xxxxxxxx 1RIDNYYY	Indirect addressing -- address is in AR(ARP)
          ||||-+-
          |||| |
          |||| +-------	next ARP value if N = 1
          |||+---------	0 = leave ARP unchanged,  1 = set ARP = YYY
          ||+----------	0 = no change,  1 = decrement AR(ARP) by 1 or AR0
          |+-----------	0 = no change,  1 = increment AR(ARP) by 1 or AR0
          +------------	0 = use 1 as the value,  1 = use AR0 as the value

			The address is contained in the Auxilliary register
			pointed to by ARP.  This register may be modified
			and a new one selected by the appropriate choice of
			address modes shown in the table below:

Instruction bits
Op-Code  Address	Notation	Operation
-------- --------	--------	-------------------------------------
xxxxxxxx 10000YYY	*		No change to ARs/ARP
xxxxxxxx 10001YYY	*,Y		Y -> ARP
xxxxxxxx 10010YYY	*-		AR(ARP) - 1 -> AR(ARP)
xxxxxxxx 10011YYY	*-,Y		AR(ARP) - 1 -> AR(ARP);  Y -> ARP
xxxxxxxx 10100YYY	*+		AR(ARP) + 1 -> AR(ARP)
xxxxxxxx 10101YYY	*+,Y		AR(ARP) - 1 -> AR(ARP);  Y -> ARP
xxxxxxxx 11000YYY	*BR0-		AR(ARP) - rcAR0 -> AR(ARP)
xxxxxxxx 11001YYY	*BR0-,Y		AR(ARP) - rcAR0 -> AR(ARP);  Y -> ARP
xxxxxxxx 11010YYY	*0-		AR(ARP) - AR0 -> AR(ARP)
xxxxxxxx 11011YYY	*0-,Y		AR(ARP) - AR0 -> AR(ARP);  Y -> ARP
xxxxxxxx 11100YYY	*0+		AR(ARP) + AR0 -> AR(ARP)
xxxxxxxx 11101YYY	*0+,Y		AR(ARP) + AR0 -> AR(ARP);  Y -> ARP
xxxxxxxx 11110YYY	*BR0+		AR(ARP) + rcAR0 -> AR(ARP)
xxxxxxxx 11111YYY	*BR0+,Y		AR(ARP) + rcAR0 -> AR(ARP);  Y -> ARP