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The
68230 Board |
| Jumpers |
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Default settings: |
place Jumpers as
shown in RED below |
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J1 CLK - Timer
Clock |
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This Jumper
determines how the 68230 timer is clocked. The maximum
clock frequency for the timer is 10MHz and so the
dedicated clock option MUST be selected if the system
clock is greater than 10MHz. |
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J1 pins 1-2 short
- system clock |
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J1 pins 2-3 short
- dedicated timer clock |
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The dedicated
timer clock frequency by default is 10MHz - to change
this frequency swap out the on board oscillator
(Y1) for a different frequency part. |
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JB1 IACK -
Interrupt Acknowledge |
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This Jumper Block
setting must match the chosen JB2 setting. |
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JB2 IRQ -
Interrupt Priority |
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This Jumper Block
sets the timer interrupt priority (1=low, 6=high, 7=non
maskable). |
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