ECE 521 Microprocessor Systems

UiTM MOTOROLA 68000 DIO TRAINER BOARD

INPUT/OUTPUT CONNECTOR BOTTOM LAYER TOP LAYER

MOTOROLA 68000 MICROPROCESSOR ROM AT28C64B (ATMEL) Voltage regulator 40 ways I/O Connector Halt / Error LED EVEN ROM EVEN RAM +12V Dc Power Socket Power LED Crystal Oscillator 10MHz RESET BUTTON MOTOROLA 68000 MICROPROCESSOR ODD ROM ODD RAM

INPUT/OUTPUT INTERFACE CIRCUIT 40-PIN IDE CABLE INPUT/OUTPUT INTERFACE CIRCUIT 68000 DIO TRAINER BOARD

HOW TO DESIGN INPUT/OUTPUT INTERFACE CIRCUIT Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 1 Y ADDRESS CONNECTION Y0 $000000 RESERVE FOR ROM Y1 $200000 RESERVE FOR RAM Y2 $400000 FREE Y3 $600000 Y4 $800000 Y5 $A00000 Y6 $C00000 RESERVE FOR 68230 Y7 $E00000

EXAMPLE – CONNECTION TO LATCH TURN ON LED1 ORG $0 DC.L $204000 DC.L START ORG $400 START MOVE.B #$FD,$600000 END START TURN ON LED2 LED1 LED2 ORG $400 MOVE.B #%11111011,$600000 END START Note : MAIN PROGRAM START FROM ADDRESS $400 RAM ADDRESS START FROM $200000 All Vcc and Gnd should be connected to here

EXAMPLE – CONNECTION TO BUFFER ORG $0 DC.L $204000 DC.L START ORG $400 START MOVE.W $A00000,D0 AND.B #$01,D0 CMP.B #0,D0 BEQ SWITCH BRA START SWITCH DO SOMETHING ….. END START All Vcc and Gnd should be connected to here

EXAMPLE – CONNECTION TO MORE THAN 1 I/O INTERFACE ORG $0 DC.L $204000 DC.L START ORG $400 BUFFER EQU $400000 LATCH EQU $800000 START MOVE.W BUFFER,D0 MOVE.B D0, LATCH BRA START END START

(Register select pins) EXAMPLE – CONNECTION TO PIT 68230 D0-D7 D0-D7 PA0-PA7 DTACK* DTACK* PB0-PB7 R/W* R/W* CLK CLK PC0-PC7 RESET* RESET* A6-A23 MAD CS* (Register select pins) RS1-RS5 A1-A5 M68k M68230

EXAMPLE – CONNECTION TO PIT 68230

EXAMPLE – CONNECTION TO PIT 68230 (PROGRAMMING) ORG $0 DC.L $204000 DC.L START ORG $400 BUFFER EQU $X00000 ; Yx OF YOUR CHOICES LATCH EQU $X00000 ; Yx OF YOUR CHOICES LED EQU $X00000 ; Yx OF YOUR CHOICES PGCR EQU $C00001 ; REFER TO 68230 DATASHEET PACR EQU $C0000x ; REFER TO 68230 DATASHEET PBCR EQU $C0000x ; REFER TO 68230 DATASHEET …. INIT MOVE.B #$00,PGCR ; PORT INITIALIZATION ROUTINE MOVE.B #$80,PACR ; FOR 68230 PI/T MOVE.B #$80,PBCR START MOVE.B #$55,LATCH ; MAIN PROGRAM STARTS HERE… END START

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