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Compiling Programs

Environment Settings

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Object (OBJ) File

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Source (SRC) File

ONEREGBANK

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Advanced Programming

8051 Derivatives

Library Reference

Appendix

ONEREGBANK Compiler Directive

Abbreviation	OB
Arguments	None.
Default	None.
µVision	Options — C51 — Misc controls.
Description	The C51 Compiler selects registerbank 0 on entry to interrupts that do not specify the using attribute. This is done at the beginning of the interrupt service routine with the MOV PSW,#0 instruction. This ensures that high-priority interrupts that do not use the using attribute can interrupt lower priority interrupts that use a different registerbank. If your application uses only one registerbank for interrupts, you may use the ONEREGBANK directive. This elimitates the MOV PSW,#0 instruction.
Example	C51 SAMPLE.C ONEREGBANK #pragma OB

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