Texas Instruments manual ±5. MSP50P614/MSP50C614 Addressing Modes Summary

Instruction Syntax and Addressing Modes

Table 4±5. MSP50P614/MSP50C614 Addressing Modes Summary

ADDRESSING	SYNTAX	OPERATION
Direct	name [dest,] [src,] *dma16 [*2] [, next A]	Second word operand (dma16) used directly as memory
	name *dma16 [*2] [,src] [, next A]	address.
Long Relative	name [dest] [,src] ,*Rx+offset16 [, next A]	Selects one of 8 address registers as base value and adds
	name *Rx+offset16 [,src] [, next A]	the value in the second word operand. Does not modify the
		base address register.
Relative to R5 name [dest] [,src] ,*Rx+R5 [, next A]		Selects one of 8 address registers as base value and adds
(INDEX)	name *Rx+R5 [,src] [, next A]	the value in R5. Does not modify the base address register.
Indirect	name [dest] [, src] ,*Rx++R5 [, next A]	Selects one of 8 address registers to be used as the ad-
	name [dest] [, src] ,*Rx [, next A]	dress, post modifications of increment, decrement, and +
	name [dest] [, src] ,*Rx++ [, next A]	INDEX(R5) are possible.
	name [dest] [, src] ,*RxÐ [, next A]
	name *Rx++R5 [, src] [, next A]
	name *Rx [, src] [, next A]
	name *Rx++ [, src] [, next A]
	name *Rx±± [, src] [, next A]

Short Relative name [dest] [, src] ,*R6+offset7 [, next A] name *R6+offset7 [, src] [, next A]

Selects PAGE(R6) register as the base address and adds a 7 bit positive address offset from operand field (b6±b0). This permits the relative addressing of 128 bytes or 64 words. Does not modify the PAGE address register. k is shown as constant.

Global Flag	name TFn, dma6	For use with flag instructions only. Adds lower 7 bits of
	name dma6, TFn	instruction to a fixed address base reference of zero. 64
		fixed flags are addressed by this mode beginning at ad-
		dress 0000h.
Relative Flag	name TFn, *R6+offset6	For use with flag instructions only. Adds lower 7 bits of
	name *R6+offset6, TFn	instruction(lsb set to zero) to a address base reference
		stored in the PAGE register (R6). 64 flags relative to PAGE
		may be addressed with this mode.

Table 4±6. Auto Increment and Auto Decrement Modes

Operation	Syntax		next A
No modification		0		0
Aufto increment	++A	0		1
Auto decrement	±±A	1		0
String mode		1		1

Table 4±6 describes the accumulator pointer auto preincrement or predecrement syntax. Not all instructions can premodify accumulator pointers. The next A field is a two bit field using bits 10 and 11 of only certain classes of instructions. Instructions with a [next A] have either a ±±A or a ++A in the instruction. See Table 4±6.

Assembly Language Instructions 4-11