IS-Dev Kit-8 User Manual
7850 East Gelding Drive • Scottsdale, AZ 85260-3420
IS-Dev Kit 8 Users Manual A.doc
Page 12 of 31
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•
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1209
Attribute Block at address 0001H
Current
Address
Top
Switch
Address
Middle
Switch
Address
Bottom
Switch
Address
End
Address Timer1 Timer2
0001H
0002H
0006H
0007H
0000H
00H
00H
Since the Timer1 is zero the timer does not run so there will be no changes based on the timer.
The image at the address 0001H is displayed until any of the switches are pressed:
Pressing the Top Switch
Attribute Block at address 0001H
Current
Address
Top
Switch
Address
Middle
Switch
Address
Bottom
Switch
Address
End
Address Timer1 Timer2
0001H
0002H
0006H
0007H
0000H
00H
00H
If the top switch is pressed, the image at address 0002H is displayed and the Attribute Block of address 0002H
becomes active.
Attribute Block at address 0002H
Current
Address
Top
Switch
Address
Middle
Switch
Address
Bottom
Switch
Address
End
Address Timer1 Timer2
0002H
0000H
0000H
0000H
0005H
01H
FFH
Since all the switch addresses are zero there will be no changes if a switch gets pressed. The timer is 255ms. If
there is no switch activity for 255ms the timer expires causing the next image, 0003H, to be displayed. This
continues until images 0004H and 0005H are also displayed. When the timer expires at address 0005H the
address is equal to the End Address. The Middle Switch Address from the Attribute Block of 0005H is then
checked. Please note the attribute information of addresses 0003H and 0004H are not used.
Attribute Block at address 0005H
Current
Address
Top
Switch
Address
Middle
Switch
Address
Bottom
Switch
Address
End
Address Timer1 Timer2
0005H
0002H
0001H
0014H
0010H
24H
35H
The image at address 0001H is displayed and the Attribute Block of address 0001H becomes active. Notice that
the other attributes within the Attribute Block of address 0005H are ignored.
