XR16L651 Datasheet, PDF (56/56 Pages) Exar Corporation – 2.25V TO 5.5V UART WITH 32-BYTE FIFO

XR16L651
2.25V TO 5.5V DUART WITH 32-BYTE FIFO
áç
REV. 1.3.0
4.2 TRANSMIT HOLDING REGISTER (THR) - WRITE-ONLY ......................................................................... 25
4.3 INTERRUPT ENABLE REGISTER (IER) - READ/WRITE ........................................................................... 25
4.3.1 IER versus Receive FIFO Interrupt Mode Operation................................................................................ 25
4.3.2 IER versus Receive/Transmit FIFO Polled Mode Operation .................................................................... 26
4.4 INTERRUPT STATUS REGISTER (ISR) - READ-ONLY ............................................................................ 27
4.4.1 Interrupt Generation: ................................................................................................................................ 27
4.4.2 Interrupt Clearing:..................................................................................................................................... 27
4.5 FIFO CONTROL REGISTER (FCR) - WRITE-ONLY ............................................................................... 28
TABLE 9: INTERRUPT SOURCE AND PRIORITY LEVEL ............................................................................................................................... 28
4.6 LINE CONTROL REGISTER (LCR) - READ/WRITE ................................................................................. 29
TABLE 10: TRANSMIT AND RECEIVE FIFO TRIGGER LEVEL SELECTION WITH AUTO RTS HYSTERESIS....................................................... 29
TABLE 11: PARITY SELECTION................................................................................................................................................................ 30
4.7 MODEM CONTROL REGISTER (MCR) OR GENERAL PURPOSE OUTPUTS CONTROL - READ/WRITE ........ 31
4.8 LINE STATUS REGISTER (LSR) - READ ONLY ..................................................................................... 32
4.9 EXTRA FEATURE REGISTER (XFR) - WRITE ONLY .............................................................................. 33
4.10 MODEM STATUS REGISTER (MSR) - READ ONLY ............................................................................. 34
4.11 INFRARED TRANSMIT PULSE WIDTH CONTROL REGISTER (IRPW) - WRITE ONLY ............................. 35
4.12 SCRATCH PAD REGISTER (SPR) ...................................................................................................... 35
4.13 BAUD RATE GENERATOR DIVISORS (DLL AND DLM) - READ/WRITE .................................................. 35
4.14 DEVICE IDENTIFICATION REGISTER (DVID) - READ ONLY .................................................................. 35
4.15 DEVICE REVISION REGISTER (DREV) - READ ONLY ......................................................................... 35
4.16 ENHANCED FEATURE REGISTER (EFR) ............................................................................................ 35
TABLE 12: SOFTWARE FLOW CONTROL FUNCTIONS ............................................................................................................................... 36
4.17 SOFTWARE FLOW CONTROL REGISTERS (XOFF1, XOFF2, XON1, XON2) - READ/WRITE ............... 37
TABLE 13: UART RESET CONDITIONS ............................................................................................................................................. 38
ELECTRICAL CHARACTERISTICS ................................................................................39
DC ELECTRICAL CHARACTERISTICS ...........................................................................................................39
TABLE 14: XR16L651 VOL SINK CURRENT CHART ............................................................................................................................... 40
TABLE 15: XR16L651 VOH SOURCE CURRENT CHART ......................................................................................................................... 41
AC ELECTRICAL CHARACTERISTICS............................................................................................................42
TA=0O TO 70OC (-40O TO +85OC FOR INDUSTRIAL GRADE PACKAGE), VCC IS 2.90V TO 5.5V, 70 PF LOAD
WHERE APPLICABLE42
FIGURE 16. CLOCK TIMING .................................................................................................................................................................... 44
FIGURE 17. MODEM INPUT/OUTPUT TIMING............................................................................................................................................ 45
FIGURE 18. 16 MODE (INTEL) DATA BUS READ TIMING WITH AS# TIED TO GND..................................................................................... 45
FIGURE 19. 16 MODE (INTEL) DATA BUS WRITE TIMING WITH AS# TIED TO GND ................................................................................... 46
FIGURE 20. 16 MODE (INTEL) DATA BUS READ TIMING USING AS#......................................................................................................... 46
FIGURE 21. 16 MODE (INTEL) DATA BUS WRITE TIMING USING AS# ....................................................................................................... 47
FIGURE 22. 68 MODE (MOTOROLA) DATA BUS READ TIMING.................................................................................................................. 47
FIGURE 23. 68 MODE (MOTOROLA) DATA BUS WRITE TIMING ................................................................................................................ 48
FIGURE 24. DATA BUS READ TIMING IN PC MODE ................................................................................................................................. 48
FIGURE 25. DATA BUS WRITE TIMING IN PC MODE ................................................................................................................................ 49
FIGURE 26. RECEIVE READY & INTERRUPT TIMING [NON-FIFO MODE] ................................................................................................... 49
FIGURE 27. TRANSMIT READY & INTERRUPT TIMING [NON-FIFO MODE] ................................................................................................. 50
FIGURE 28. RECEIVE READY & INTERRUPT TIMING [FIFO MODE, DMA DISABLED].................................................................................. 50
FIGURE 29. RECEIVE READY & INTERRUPT TIMING [FIFO MODE, DMA ENABLED]................................................................................... 51
FIGURE 30. TRANSMIT READY & INTERRUPT TIMING [FIFO MODE, DMA MODE DISABLED] ..................................................................... 51
FIGURE 31. TRANSMIT READY & INTERRUPT TIMING [FIFO MODE, DMA MODE ENABLED] ...................................................................... 52
PACKAGE DIMENSIONS (48 PIN TQFP - 7 X 7 X 1 MM)..................................................................................53
REVISION HISTORY ....................................................................................................................................54
TABLE OF CONTENTS ................................................................................................................................. I
II