B3. B2. B1. B0. P3* Port 3. B0H. RD. WR. T1. T0. INT1. INT0. TXD. RXD. FFH. A7. A6. A5 ... 87. 86. 85. 84. 83. 82. 81. 80. P0* Port 0. 80H. AD7. AD6. AD5. AD4. AD3. AD2. AD1. AD0. FFH. Philips ...Download NXP 80C554, 83/87C554 Data SheetDownload
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