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6809: Document direct addressing mode

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Karol Stasiak 2020-07-31 01:57:10 +02:00
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5
docs/lang/assembly6809.md
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@ -42,6 +42,11 @@ but you need to be careful with using absolute vs immediate addressing:
} }
return result return result
} }
To use the direct addressing mode, prepend the argument with `<`:
CLR <$6f // clears the byte $6f in the direct page
CLR $6f // clears the byte $006f (absolute address!)
Any assembly opcode can be prefixed with `?`, which allows the optimizer change it or elide it if needed. Any assembly opcode can be prefixed with `?`, which allows the optimizer change it or elide it if needed.
Opcodes without that prefix will be always compiled as written. Opcodes without that prefix will be always compiled as written.

2
docs/various/asmdiff.md
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@ -30,5 +30,7 @@ Colons are required in label declarations.
* 6809: `0,X` is assembled the same as `,X`. * 6809: `0,X` is assembled the same as `,X`.
* 6502: To enforce direct-page addressing, prepend the argument with `<`: `<arg`.