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SC68C94A1N Datasheet(PDF) 5 Page - NXP Semiconductors |
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SC68C94A1N Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 33 page Philips Semiconductors Product specification SC68C94 Quad universal asynchronous receiver/transmitter (QUART) 1995 May 1 5 Table 1. QUART Registers1 A5:0 READ (RDN = Low) WRITE (WRN = Low) 000000 Mode Register a (MR0a, MR1a, MR2a) Mode Register a (MR0a, MR1a, MR2a) 000001 Status Register a (SRa) Clock Select Register a (CSRa) 000010 Reserved Command Register a (CRa) 000011 Receive Holding Register a (RxFIFOa) Transmit Holding Register a (TxFIFOa) 000100 Input Port Change Reg ab (IPCRab) Auxiliary Control Reg ab (ACRab) 000101 Interrupt Status Reg ab (ISRab) Interrupt Mask Reg ab (IMRab) 000110 Counter/Timer Upper ab (CTUab) Counter/Timer Upper Reg ab (CTURab) 000111 Counter/Timer Lower ab (CTLab) Counter/Timer Lower Reg ab (CTLRab) 001000 Mode Register b (MR0b, MR1b, MR2b) Mode Register b (MR0b, MR1b, MR2b) 001001 Status Register b (SRb) Clock Select Register b (CSRb) 001010 Reserved Command Register b (CRb) 001011 Receive Holding Register b (RxFIFOb) Transmit Holding Register b (TxFIFOb) 001100 Output Port Register ab (OPRab) Output Port Register ab (OPRab) 001101 Input Port Register ab (IPRab) I/OPCRa (I/O Port Control Reg a) 001110 Start Counter ab I/OPCRb (I/O Port Control Reg b) 001111 Stop Counter ab Reserved 010000 Mode Register c (MR0c, MR1c, MR2c) Mode Register c (MR0c, MR1c, MR2c) 010001 Status Register c (SRc) Clock Select Register c (CSRc) 010010 Reserved Command Register c (CRc) 010011 Receive Holding Register c (RxFIFOc) Transmit Holding Register c (TxFIFOc) 010100 Input Port Change Reg cd (IPCRcd) Auxiliary Control Reg cd (ACRcd) 010101 Interrupt Status Reg cd (ISRcd) Interrupt Mask Reg cd (IMRcd) 010110 Counter/Timer Upper cd (CTUcd) Counter/Timer Upper Reg cd (CTURcd) 010111 Counter/Timer Lower cd (CTLcd) Counter/Timer Lower Reg cd (CTLRcd) 011000 Mode Register d (MR0d, MR1d, MR2d) Mode Register d (MR0d, MR1d, MR2d) 011001 Status Register d (SRd) Clock Select Register d (CSRd) 011010 Reserved Command Register d (CRd) 011011 Receive Holding Register d (RxFIFOd) Transmit Holding Register d (TxFIFOd) 011100 Output Port Register cd (OPRcd) Output Port Register cd (OPRcd) 011101 Input Port Register cd (IPRcd) I/OPCRc (I/O Port Control Reg c) 011110 Start Counter cd I/OPCRd (I/O Port Control Reg d) 011111 Stop Counter cd Reserved 100000 Bidding Control Register a (BCRa) Bidding Control Register a (BCRa) 100001 Bidding Control Register b (BCRb) Bidding Control Register b (BCRb) 100010 Bidding Control Register c (BCRc) Bidding Control Register c (BCRc) 100011 Bidding Control Register d (BCRd) Bidding Control Register d (BCRd) 100100 Reserved Power Down 100101 Reserved Power Up 100110 Reserved Disable DACKN 100111 Reserved Enable DACKN 101000 Current Interrupt Register (CIR) Reserved 101001 Global Interrupting Channel Reg (GICR) Interrupt Vector Register (IVR) 101010 Global Int Byte Count Reg (GIBCR) Update CIR 101011 Global Receive Holding Reg (GRxFIFO) Global Transmit Holding Reg (GTxFIFO) 101100 Interrupt Control Register (ICR) Interrupt Control Register (ICR) 101101 Reserved BRG Rate. 00 = low; 01 = high 101110 Reserved Set X1/CLK divide by two2 101111 Reserved Set X1/CLK Normal2 110000–111000 Reserved Reserved 111001 Test Mode Test Mode 111010–111111 Reserved Reserved NOTES: 1. Registers not explicitly reset by hardware reset power up randomly. 2. In X1/CLK divide by 2 all circuits receive the divided clock except the BRG and change-of-state detectors. |
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