35.1.2. MOTOROLA 68K

 
  THIS SECTION IS UNDER CONSTRUCTION  
 

  


Motorola 68020:
  

Motoroal 68060:
  


68000:
  

68020:
  

68040:
  

68060:
  




  
  Эволюция 
 
	68000 ['79?]
	  |
	  V
	68020 ['85]
	  |
	  V
	68030
	  |
	  V
	68040 ['89]
	  |
	  V
	68060 ['93]



  
  Регистры 
 

	d0..d7			(Data Registers)
	a0..a6			(Address Registers)
	a7  usp  ssp		(User Stack Pointer/Supervisor stack pointer)
	pc
	fp0..fp7		(FP on MC68040 etc or on MC68881 etc)
	Zero Register:	None
	Direction:	------------->
		OP	rs1,rs2,rd

	Memory Access:
		add	d6,d0
		add	(a4)+,d2
		add	(20,a4,d5),d0
	Immediate Operands:
		add	#&5,d5
			(Note:		5	- Decimal (Default)
				       &5	- Decimal
				     %101	- Binary
				       @5	- Octal
				       $5	- Hexdecimal	)
	Byte Order:	Big-endian
	Command Len:	Mainly 16-bit
	Generations:
		68000	- main CPU (MUL/DIV only 16->32,32->16)
		68020	- + normal MUL/DIV	
	---------------------------------------------------------------

Регистр флагов (CCR)
	XNZVC
		C - Carry
		V - Overflow
		Z - Zero
		N - Negative
		X - Extend (set as C for arithmetic operation only,
			    otherwize unchanged)

	15	Tracing
	13	Supervisor
	10..8	Interrupt mask I
	4	X
	3	N
	2	Z
	1	V
	0	C



Форматы обращения к памяти:
		offset
		(An)
		(An)+
		-(An)
		(disp16,An)
		(disp8,An,Xn)
		(An,Rk).W		size 16
		(An,Rk).L		size 32
		(disp16,PC)
		(disp8,PC,Xn)
		



  
  Особенности 
 
	CISC микропроцессор
	Big-endian
	Расширения Multimedia: нет