XRT16C854 Datasheet, PDF (40/54 Pages) Exar Corporation – 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO

XR16C854/854D
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
xr
REV. 3.0.1
TABLE 18: UART RESET CONDITIONS FOR CHANNELS A-D
REGISTERS
RESET STATE
DLL
DLM
RHR
THR
IER
FCR
ISR
LCR
MCR
LSR
MSR
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x01
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x60
Bits 3-0 = Logic 0
Bits 7-4 = Logic levels of the inputs inverted
SPR
EMSR
FLVL
TRG
FC
FCTR
EFR
XON1
XON2
XOFF1
XOFF2
FSTAT
I/O SIGNALS
Bits 7-0 = 0xFF
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0xFF
RESET STATE
TX
IRTX
RTS#
DTR#
RXRDY#
TXRDY#
INT
IRQ#
Logic 1
Logic 0
Logic 1
Logic 1
Logic 1
Logic 0
XR16C854 = Three-State Condition
XR16C854D = Logic 0
Logic 1 (68 mode, INTSEL = 0)
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