DR805X Datasheet, PDF (43/79 Pages) Digital Core Design – 8-bit RISC Microcontroller Instructions set details ver 3.10

DR805x Instructions set details
3.19. JNC
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Instruction: JNC rel
Function: Jump if carry is not set
Description:
If the carry flag is a zero, branch to the address indicated; otherwise
proceed with the next instruction. The branch destination is computed
by adding the signed relative-displacement in the second instruction
byte to the PC, after incrementing the PC twice to point to the next
instruction. The carry flag is not modified.
Operation:
(PC) ← (PC) + 2
if (C) = 0 then
(PC) ← (PC) + rel
Bytes:
Cycles:
2
3 – C=0
2 – C=1
Encoding:
01010000
relative address
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