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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M68ICS08GR датащи(PDF) 97 Page - Freescale Semiconductor, Inc |
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M68ICS08GR датащи(HTML) 97 Page - Freescale Semiconductor, Inc |
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97 / 408 page  Break Module (BRK) Break Module Registers MC68HC908GR8 — Rev 4.0 Technical Data MOTOROLA Break Module (BRK) 97 BW — Break Wait Bit This read/write bit is set when a break interrupt causes an exit from wait mode. Clear BW by writing a logic 0 to it. Reset clears BW. 1 = Break interrupt during wait mode 0 = No break interrupt during wait mode BW can be read within the break interrupt routine. The user can modify the return address on the stack by subtracting 1 from it. The following code is an example. This code works if the H register was stacked in the break interrupt routine. Execute this code at the end of the break interrupt routine. HIBYTE EQU 5 LOBYTE EQU 6 ; If not BW, do RTI BRCLR BW,BSR, RETURN ; ; See if wait mode or stop mode was exited by break. TST LOBYTE,SP ; If RETURNLO is not 0, BNE DOLO ; then just decrement low byte. DEC HIBYTE,SP ; Else deal with high byte also. DOLO DEC LOBYTE,SP ; Point to WAIT/STOP opcode. RETURN PULH RTI ; Restore H register. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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