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Doc: Add explanation of flag conditions

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Riyyi
2022-08-25 11:42:46 +02:00
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doc/terminology.org
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@@ -44,6 +44,18 @@ We start counting from the right as bit *#0*!
d = data \\ d = data \\
n = constant n = constant
**** Flag conditions
Flag conditions, sometimes referred to as ~cc~, are the state the flags need to
be in to execute the opcode. There are four possible checks[[#references][(4)]]:
| Code | Meaning | State |
|------+---------------------+-------|
| C | Carry flag is set | 1 |
| NC | Carry flag is unset | 0 |
| Z | Zero flag is set | 1 |
| NZ | Zero flag is unset | 0 |
*** Variables *** Variables
| Name | Meaning | | Name | Meaning |
@@ -59,3 +71,4 @@ n = constant
1. https://gbdev.io/pandocs/Memory_Map.html 1. https://gbdev.io/pandocs/Memory_Map.html
2. https://gbdev.io/pandocs/Specifications.html 2. https://gbdev.io/pandocs/Specifications.html
3. [[https://robdor.com/2016/08/10/gameboy-emulator-half-carry-flag/]["A Visual Guide to the Gameboy's Half-Carry Flag"]]. robdor.com. Retrieved 24 Aug 2022. 3. [[https://robdor.com/2016/08/10/gameboy-emulator-half-carry-flag/]["A Visual Guide to the Gameboy's Half-Carry Flag"]]. robdor.com. Retrieved 24 Aug 2022.
4. [[http://www.devrs.com/gb/files/opcodes.html]["GameBoy Opcode Summary"]]. devrs.com. Retrieved 25 Aug 2022.