STOS STORE (BYTE/OR/ STOS
WORD) STRING
Operation: | Flags Affected: |
(OEST) +- (SRC) | None |
if (DF) = 0 then (DI) ~ (DI) + DELTA |
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else (01) +- (01) - OELTA |
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Description:
STOS destination-string
STOS (Store String) transfers a byte or word from register AL or AX to the string element addressed by DI and updates Dr to point to the next location in the string. As a repeated operation, STOS provides a convenient way to initialize a string to a constant value (e.g., to blank out a print line).
Encoding:
11010101wl
if w = 0 then SRC = AL, OEST = (01), OELTA = 1 else SRC = AX, OEST = (01) +1:(01), OELTA = 2
5T05 Operands | Clocks· | Transfers Bytes 5T05 Coding Example |
11 (15) | 1 | j | |
(repeat) | 9+10(14)/rep | 1/rep |
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1STOS PRINT_LINE
1REP STOS DISPLAY
*b(w): where b denotes the number of clock cycles for byte operands and w denotes the number of clock cycles for word operands.
