Motorola M68CPU32BUG Manuel d'utilisateur télécharger pdf (Page 41)

OPERATING INSTRUCTIONS

M68332BCC/D 3-13 MOTOROLA

REV 1

Enter the periodic interrupt timer (PIT) time-out program starting at address $5000:

EXAMPLE PROGRAM

PROGRAM DESCRIPTION

CPU32Bug>MM 5000;DI<CR> Memory modify at location $5000 with

disassembly option.

5000 MOVE.L #$501C,$78<CR> Set-up level six vector table.

5008 MOVE.L #$061E0120,$FFFA22<CR> Initialize PIT.

5012 LPSTOP #$2500<CR> Execute LPSTOP Instruction.

5018 BRA.W $5012<CR> Loop

501C MOVEA.W #$5100,A0<CR> Beginning of message.

5020 MOVEA.W #$510E,A1<CR> End of message.

5024 BTST.B #$0,$FFFC0C<CR> Check for SCI not busy.

502C BEQ.B $5024<CR> Branch until free.

502E MOVE.B (A0)+,$FFFC0F<CR> Send message byte.

5034 CMPA.W A0,A1<CR> Check for end of message.

5036 BNE.W $5024<CR> Branch until done.

503A RTE<CR> Return from print routine.

Enter the ASCII code for the output message, PIT TIME-OUT. Each time this message appears

when running the program, indicates the program has completed a loop. Enter the following

ASCII code at memory location $5100:

CPU32Bug>MS 5100 ’PIT TIME-OUT’ODOA<CR> Memory modify at location $5100.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 67 68

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Motorola M68CPU32BUG Manuel d'utilisateur Page 41