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MC68HC11E1CFN2 Datasheet(PDF) 76 Page - Motorola, Inc |
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MC68HC11E1CFN2 Datasheet(HTML) 76 Page - Motorola, Inc |
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76 / 268 page  Central Processor Unit (CPU) Data Sheet M68HC11E Family — Rev. 5 76 Central Processor Unit (CPU) MOTOROLA Figure 4-2. Stacking Operations 4.2.5 Program Counter (PC) The program counter, a 16-bit register, contains the address of the next instruction to be executed. After reset, the program counter is initialized from one of six possible vectors, depending on operating mode and the cause of reset. See Table 4-1. ➩ SP–2 STACK RTNH SP–1 RTNL SP 70 PC MAIN PROGRAM $9D = JSR JSR, JUMP TO SUBROUTINE dd NEXT MAIN INSTR. RTN DIRECT PC MAIN PROGRAM $AD = JSR ff NEXT MAIN INSTR. RTN INDEXED, X PC MAIN PROGRAM $18 = PRE ff NEXT MAIN INSTR. RTN INDEXED, Y $AD = JSR PC MAIN PROGRAM $BD = PRE ll NEXT MAIN INSTR. RTN INDEXED, Y hh SP STACK CCR SP+1 ACCB SP+2 ACCA SP+3 IXH SP+4 IXL SP+5 IYH SP+6 IYL SP+7 RTNH SP+8 ➩ SP+9 70 RTNL PC INTERRUPT ROUTINE $3B = RTI ➩ SP–9 STACK CCR SP–8 ACCB SP–7 ACCA SP–6 IXH SP–5 IXL SP–4 IYH SP–3 IYL SP–2 RTNH SP–1 SP 70 RTNL PC MAIN PROGRAM $3F = SWI PC MAIN PROGRAM $3E = WAI SWI, SOFTWARE INTERRUPT WAI, WAIT FOR INTERRUPT RTI, RETURN FROM INTERRUPT ➩ SP–2 STACK RTNH SP–1 RTNL SP 70 PC MAIN PROGRAM $8D = BSR PC MAIN PROGRAM $39 = RTS BSR, BRANCH TO SUBROUTINE RTS, RETURN FROM SUBROUTINE SP STACK RTNH SP+1 RTNL ➩ SP+2 70 LEGEND: RTN = ADDRESS OF NEXT INSTRUCTION IN MAIN PROGRAM TO BE EXECUTED UPON RETURN FROM SUBROUTINE RTNH = MOST SIGNIFICANT BYTE OF RETURN ADDRESS RTNL = LEAST SIGNIFICANT BYTE OF RETURN ADDRESS ➩ = STACK POINTER POSITION AFTER OPERATION IS COMPLETE dd = 8-BIT DIRECT ADDRESS ($0000–$00FF) (HIGH BYTE ASSUMED TO BE $00) ff = 8-BIT POSITIVE OFFSET $00 (0) TO $FF (255) IS ADDED TO INDEX hh = HIGH-ORDER BYTE OF 16-BIT EXTENDED ADDRESS ll = LOW-ORDER BYTE OF 16-BIT EXTENDED ADDRESS rr= SIGNED RELATIVE OFFSET $80 (–128) TO $7F (+127) (OFFSET RELATIVE TO THE ADDRESS FOLLOWING THE MACHINE CODE OFFSET BYTE) Table 4-1. Reset Vector Comparison Mode POR or RESET Pin Clock Monitor COP Watchdog Normal $FFFE, F $FFFC, D $FFFA, B Test or Boot $BFFE, F $BFFC, D $BFFA, B Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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