In processors, overflow flag indicates that sign bit has been changed during adding or subtracting operations But carry flag means adding or subtracting two registers has carry or borrow bit. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Binary arithmetic - overflow and carryout at same time? Ask Question. Asked 5 years, 9 months ago.
Active 2 months ago. Viewed 23k times. Darklink Darklink 1 1 gold badge 2 2 silver badges 12 12 bronze badges. Add a comment. Active Oldest Votes. Ross Millikan Ross Millikan k 26 26 gold badges silver badges bronze badges. Overflow indicates that a signed result is too big or too small to fit in the destination; Carry indicates that an unsigned result is too big to fit in the destination.
So for instance on a typical 8-bit processor, adding the hex values 0xE0 and 0x40 will set the Carry flag but not the Overflow flag. If you underflow a subtraction, you can fix that with a borrow if there is something to borrow from. Similarly, a signed add can carry or overflow if there is not enough room. Asked 9 years, 11 months ago. Active 1 year, 1 month ago. Viewed 25k times.
I have the next code: mov al, -5 add al, add al, 1 As I check it, the overflow flag and the carry flag will set in the first operation, and in the second, only the overflow will set. In signed number, the result is , It's fit to 8-bit signed, and the overflow shouldn't be set.
Whats wrong? Peter Cordes k 39 39 gold badges silver badges bronze badges. Tom O Tom O 1 1 gold badge 4 4 silver badges 7 7 bronze badges. See Understanding Carry vs. Add a comment. Active Oldest Votes. Learn more about Collectives on Stack Overflow. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Linked 1. Related Hot Network Questions. Question feed.
Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. I do not know what an is; heard of the and The is unigue in that family in the the data path is a full 16 bits wide rather than 8.
The main difference between and is that uses pipelining. The is a 16 bit computer running on a 16 bit bus. The is a 32 bit computer running on a 16 bit -sx or on a 32 bit -dx bus.
Both the and the are 16 bit processors. The runs on a 16 bit bus, and can therefore fetch and store two bytes at a time, while the runs on an 8 bit bus and can only fetch and store one byte at a time.
The has a 16 bit bus, while the has an 8 bit bus. In both A0 through A7 are shared as D0 through D7. The the , A8 through A15 is also shared as D8 through D The data bus of is 8 bit. Its operating frequency is 3. Address bus is 16 bit. The data bus of is 16 bit. Its operating sfrequency is 5 MHZ. Address bus is 20 bit. Terms 'Program Counter' and 'Instruction Pointer' are synonyms; the difference between these processors is that has a single bit address space, while has a bit address space, and addresses are composed from two 16 bit registers segment and offset; for instructions they are CS and IP.
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