XTAL1
XTAL2
A0
A1
A2
A7
nRES
nIOS R/nW nIRQ1 
6801
COM20020 |
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A0/nMUX |
| RXIN |
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A1 |
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A2/BALE |
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| 75176B or |
nCS |
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| TXEN | Equiv. | |
nRESET IN |
| nPULSE1 |
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| nPULSE2 |
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nRD/nDS |
| GND |
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nWR/nDIR |
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| Differential Driver |
nINTR |
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| Configuration | |
XTAL1 | XTAL2 |
| * Media Interface |
| may be replaced | ||
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| ||
with Figure A, B or C.
27 pF |
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| 20MHz |
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| 27 pF |
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| XTAL |
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FIGURE 3 - NON-MULTIPLEXED, 6801-LIKE BUS INTERFACE WITH RS-485 INTERFACE
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| +5V |
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| HYC9068 or | 10 | + | 0.47 |
| HYC9088 | |||
| uF |
| uF | |
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RXIN | RXIN | 6 |
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| 12 |
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nTXEN | N/C | 11 |
| 0.01 uF |
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| 5.6K | ||
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| ||
nPULSE1 | nPULSE1 |
| 1KV | |
| 1/2W | |||
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nPULSE2 | nPULSE2 |
| 5.6K |
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GND | 17, 19, |
| 1/2W |
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4, 13, 14 |
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| 3 |
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| 0.47 |
| Traditional Hybrid | |
| Configuration | |||
| uF | |||
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| + 10 |
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| uF |
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FIGURE C
14
