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UM0144 Datasheet(PDF) 72 Page - STMicroelectronics |
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UM0144 Datasheet(HTML) 72 Page - STMicroelectronics |
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72 / 92 page  ST7 Assembler Linker 72/92 UM0144 A.51 .SETDP A.52 SKIP Purpose: Set base address for direct page. Format: .SETDP <base address> Description: If you have used an ST7 processor, you'll be aware of its 'zero-page' or 'direct' addressing modes. These use addresses in the range 00..FF in shorter, faster instructions than the more general 0000..FFFF versions. Other processors use the same scheme, but with a twist: you can choose the 'base page' where the direct mode does not have to be in range 0000 00FF but can be from nn00..nnFF where nn00 is the 'base page', loaded into a register at run-time. Because the assembler cannot track what's in the base page register at run-time, you need to fill it in about the current 'base page' with the .SETDP directive. At the start of the assembly, SETDP defaults to 0000. Example: See Also: Purpose: Inserts given number of bytes with an initialization value. Format: SKIP <number of bytes>,<value to fill> Description: This directive leaves a message for the linker that you want X number of Y bytes to be inserted into the object code at this point. Both the arguments must be absolute values rather than external or relative values. Example: See Also: .SETDP $400 ld A,$401 ; direct mode chosen SKIP 100,$FF ; insert 100 bytes all $FF |
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