INTO
INTERRUPT ON OVERFLOW
INTO
Operation: | Flags Affected: |
if (OF) = 1 then
(SP) +- (SP) - 2 ((SP) +1:(SP)) +- (IF) +- 0
(TF) +- 0
(SP) +- (SP) - 2 ((SP) +1:(SP)) +- (CS) +- (12H) (SP) +- (SP) - 2 ((SP) + 1:(SP)) +- (lP) +- (10H)
None
FLAGS
(CS)
(IP)
Description:
INTO (Interrupt on Overflow) generates a software interrupt if the overflow flag (OF) is set; otherwise control proceeds to the follow- ing instruction without activating an interrupt procedure. INTO addresses the target inter- rupt procedure (its type is 4) through the inter-
rupt pointer at location lOH; it clears the TF and IF flags and otherwise operates like INT. INTO may be written following an arithmetic or logical operation to activate an interrupt procedure if overflow occurs.
Encoding:
1110011101
INTO Operands Clocks Transfers Bytes INTO Coding Example
(no operands) | (73) or 4 | 5 | 1 INTO |
