1. ECE 521 Microprocessor Systems

2. UiTM MOTOROLA 68000 DIO TRAINER BOARD

4. INPUT/OUTPUT
CONNECTOR
BOTTOM LAYER
TOP LAYER

5. 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 MICROPROCESSOR
ODD ROM
ODD RAM

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

7. HOW TO DESIGN INPUT/OUTPUT INTERFACE CIRCUITY0 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

8. 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 #% ,$600000
END START
Note :
MAIN PROGRAM START FROM ADDRESS $400
RAM ADDRESS START FROM $200000
All Vcc and Gnd should be connected to here

9. 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

10. 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

11. (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

12. EXAMPLE – CONNECTION TO PIT 68230

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

14. The End