DR805x Instructions set details
- 42 -
3.18. JNB
Instruction:
Function:
JNB bit,rel
Jump if bit is not set
Description: If the indicated bit is a zero, branch to the indicated address; otherwise
proceed with the next instruction. The branch destination is computed
by adding the signed relative-displacement in the third instruction byte
to the PC, after incrementing the PC to the first byte of the next
instruction. The bit tested is not modified. No flags are affected.
Operation:
(PC) ← (PC) + 3
if (bit) = 0 then
(PC) ← (PC) + rel.
Bytes:
Cycles:
3
4
Encoding:
0
0
1
1
0
0
0
0
bit address
relative address
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