XR19L220_07 Datasheet, PDF (43/43 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

XR19L220
REV. 1.0.1
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
4.5 INTERRUPT STATUS REGISTER (ISR) - READ-ONLY .................................................................................. 22
4.5.1 INTERRUPT GENERATION: ........................................................................................................................................ 22
4.5.2 INTERRUPT CLEARING: ............................................................................................................................................. 22
TABLE 7: INTERRUPT SOURCE AND PRIORITY LEVEL ....................................................................................................................... 23
4.6 FIFO CONTROL REGISTER (FCR) - WRITE-ONLY ........................................................................................ 23
TABLE 8: TRANSMIT AND RECEIVE FIFO TRIGGER LEVEL SELECTION .............................................................................................. 24
4.7 LINE CONTROL REGISTER (LCR) - READ/WRITE ........................................................................................ 24
TABLE 9: PARITY SELECTION .......................................................................................................................................................... 25
4.8 MODEM CONTROL REGISTER (MCR) OR GENERAL PURPOSE OUTPUTS CONTROL - READ/WRITE . 26
4.9 LINE STATUS REGISTER (LSR) - READ ONLY.............................................................................................. 27
4.10 MODEM STATUS REGISTER (MSR) - READ ONLY ..................................................................................... 28
4.11 SCRATCHPAD REGISTER (SPR) - READ/WRITE ........................................................................................ 28
4.12 BAUD RATE GENERATOR REGISTERS (DLL AND DLM) - READ/WRITE................................................. 29
4.13 DEVICE IDENTIFICATION REGISTER (DVID) - READ ONLY....................................................................... 29
4.14 DEVICE REVISION REGISTER (DREV) - READ ONLY................................................................................. 29
4.15 ENHANCED FEATURE REGISTER (EFR) .................................................................................................... 29
TABLE 10: SOFTWARE FLOW CONTROL FUNCTIONS ........................................................................................................................ 29
4.16 SOFTWARE FLOW CONTROL REGISTERS (XOFF1, XOFF2, XON1, XON2) - WRITE ONLY................... 30
TABLE 11: UART RESET CONDITIONS FOR CHANNEL A AND B ............................................................................................ 31
ABSOLUTE MAXIMUM RATINGS ................................................................................. 31
TYPICAL PACKAGE THERMAL RESISTANCE DATA (MARGIN OF ERROR: ± 15%) 31
ELECTRICAL CHARACTERISTICS................................................................................................................... 32
AC ELECTRICAL CHARACTERISTICS............................................................................................................. 33
FIGURE 12. CLOCK TIMING............................................................................................................................................................. 34
FIGURE 13. MODEM INPUT/OUTPUT TIMING .................................................................................................................................... 35
FIGURE 14. 16 MODE (INTEL) DATA BUS READ TIMING ................................................................................................................... 36
FIGURE 15. 16 MODE (INTEL) DATA BUS WRITE TIMING ................................................................................................................. 36
FIGURE 16. 68 MODE (MOTOROLA) DATA BUS READ TIMING .......................................................................................................... 37
FIGURE 17. 68 MODE (MOTOROLA) DATA BUS WRITE TIMING......................................................................................................... 37
FIGURE 18. RECEIVE READY INTERRUPT TIMING [NON-FIFO MODE] ............................................................................................... 38
FIGURE 19. TRANSMIT READY INTERRUPT TIMING [NON-FIFO MODE] ............................................................................................. 38
FIGURE 20. RECEIVE READY INTERRUPT TIMING [FIFO MODE] ....................................................................................................... 39
FIGURE 21. TRANSMIT READY INTERRUPT TIMING [FIFO MODE] ..................................................................................................... 39
PACKAGE DIMENSIONS (40 PIN QFN - 6 X 6 X 0.9 mm).............................................. 40
REVISIONS.................................................................................................................................................. 41
TABLE OF CONTENTS ..................................................................................................... I
II