Texas Instruments MSP50C614 ±44. Lookup Instructions, Instructions Description Data Transfer

Lookup Instructions

4.9 Lookup Instructions

Table lookup instructions transfer data from program memory (ROM) to data memory or accumulators. These instructions are useful for reading permanent ROM data into the user program for manipulation. For example, lookup tables can store initial filter coefficients, characters for an LCD display which can be read for display in the LCD screen, etc. There are four lookup instructions as shown in Table 4±44. Lookup instructions always read the program memory address from the second argument (which is accumulator or its offset). An asterisk (*) always precedes this accumulator to indicate that this is an address.

Table 4±44. Lookup Instructions

Instructions	Description
	Data Transfer
MOV {adrs}, *An	The program memory address is stored in accumulator An. Store the contents of
	this address in data memory location referred by addressing mode {adrs}.
MOV An[~], *An[~] [, next A]	The program memory address is stored in accumulator An or its offset An~. Store
	the contents of this address in accumulator An or An~.
MOVS {adrs}, *An	The program memory string address is stored in accumulator An. Store the
	contents of this address to the data memory string referred by the addressing
	mode {adrs}. The string length is defined in STR register.
MOVS An[~], *An[~]	The program memory string address is stored in accumulator An or its offset An~.
	Store the contents of this address to the accumulator string An or its offset An~.
	The string length is defined in STR register.

Data Manipulation on Strings

ADDS An[~], An[~], pma16	ADD the accumulator string An or its offset An~ with the program memory string at
	location pma16 and store the result to the accumulator string An or its offset An~.
	The string length is defined in STR register.
ANDS An[~], An[~], pma16	Bitwise/logical AND the string An (or its offset An~) with the program memory
	string at location pma16 and store the result in the accumulator string An or its
	offset An~. The string length is defined in STR register.
CMPS An[~], pma16	Compare the accumulator string An (or its offset An~) with the program memory
	string at location pma16 and store the result in accumulator string An or its offset
	An~. The string length is defined in STR register.
SUBS An[~], An[~], pma16	Subtract accumulator string An (or its offset An~) with program memory string at
	location pma16 and store the result in accumulator string An or its offset An~. The
	string length is defined in STR register.
XORS An[~], An[~], pma16	Bitwise/Logical XOR the accumulator string An or its offset An~ with program
	memory string at location pma16 and store the result to accumulator string An or
	its offset An~. The string length is defined in STR register.

Assembly Language Instructions 4-57