NOFRAME Compiler Directive

Abbreviation	NOF
Arguments	None.
Default	Interrupt routines are created with prolog and epilog.
µVision	This directive cannot be entered at command line level.
Description	The NOFRAME directive suppresses the prolog and epilog for an Interrupt Service Routine (ISR). By default, the C166 Compiler adds a prolog and epilog that save and restore used register to interrupt functions. The NOFRAME directive is useful with interrupt functions that never return as is the case with an interrupt that resets the MCU. Note The NOFRAME directive is active for one function only. It is therefore not possible to use it at command line level.
Example	The following example illustrates the difference between a standard interrupt frame and one created with the NOFRAME directive. 1 int i1, i2, i3; 2 3 void intr_func1 (void) interrupt 0x21 { 4 1 i1 = i2 * i3; 5 1 } 6 7 #pragma NOFRAME 8 void intr_func2 (void) interrupt 0x22 { 9 1 i1 = i2 * i3; 10 1 } ASSEMBLY LISTING OF GENERATED OBJECT CODE ; FUNCTION intr_func1 (BEGIN RMASK = @0x2030) ; SOURCE LINE # 3 0000 C6871000 SCXT MDC,#010H 0004 EC06 PUSH MDH 0006 EC07 PUSH MDL 0008 ECF4 PUSH R4 000A ECF5 PUSH R5 ; SOURCE LINE # 4 000C F2F50000 R MOV R5,i3 0010 F2F40200 R MOV R4,i2 0014 0B45 MUL R4,R5 0016 F2F40EFE MOV R4,MDL 001A F6070400 R MOV i1,MDL ; SOURCE LINE # 5 001E FCF5 POP R5 0020 FCF4 POP R4 0022 FC07 POP MDL 0024 FC06 POP MDH 0026 FC87 POP MDC 0028 FB88 RETI ; FUNCTION intr_func1 (END RMASK = @0x2030) ; FUNCTION intr_func2 (BEGIN RMASK = @0x2030) ; SOURCE LINE # 8 ; SOURCE LINE # 9 002A F2F50000 R MOV R5,i3 002E F2F40200 R MOV R4,i2 0032 0B45 MUL R4,R5 0034 F2F40EFE MOV R4,MDL 0038 F6070400 R MOV i1,MDL ; SOURCE LINE # 10 003C FB88 RETI ; FUNCTION intr_func2 (END RMASK = @0x2030)