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SC28L92 Datasheet(PDF) 5 Page - NXP Semiconductors |
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SC28L92 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 73 page SC28L92_7 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 07 — 19 December 2007 5 of 73 NXP Semiconductors SC28L92 3.3 V/5.0 V Dual Universal Asynchronous Receiver/Transmitter The data pins TxD and RxD are considered idle at the logic 1 (HIGH) level when inactive, or active when at the logic 0 (LOW) level. Comments about these levels when RS232 is referenced often refer to Mark and Space levels. Mark usually means inactive and Space means active. The voltage levels represented by the terms Mark and Space are often reversed from those above: Mark is low voltage, and Space is high voltage. Fig 2. Block diagram (68xxx mode) SC28L92 (68xxx mode) 002aad460 8 BUS BUFFER CHANNEL B (AS ABOVE) D0 to D7 OPERATION CONTROL ADDRESS DECODE R/W CONTROL RESETN I/M ground for 68xxx mode A0 to A3 CEN IACKN R/WN 4 INTERRUPT CONTROL IMR ISR GP TIMING BAUD RATE GENERATOR CLOCK SELECTORS COUNTER/ TIMER XTAL OSCILLATOR CSRA CSRB ACR CTL CTU INTRN X2 X1/CLK CHANNEL A 16-BYTE TRANSMIT FIFO TRANSMIT SHIFT REGISTER 16-BYTE RECEIVE FIFO WATCHDOG TIMER TxDA RxDA RxDB RECEIVE SHIFT REGISTER MRA0, 1, 2, 3 CRA SRA INPUT PORT CHANGE-OF- STATE DETECTORS (4) ACR IPCR IP0 to IP5 6 TxDB OUTPUT PORT FUNCTION SELECT LOGIC OPR OPCR OP0 to OP7 8 DACKN |
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