XR16C854D 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
TABLE 18: UART RESET CONDITIONS FOR CHANNELS A-D
REGISTERS
RESET STATE
DLL
DLM
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
RHR
THR
Bits 7-0 = 0xXX
Bits 7-0 = 0xXX
IER
FCR
Bits 7-0 = 0x00
Bits 7-0 = 0x00
ISR
LCR
Bits 7-0 = 0x01
Bits 7-0 = 0x00
MCR
LSR
Bits 7-0 = 0x00
Bits 7-0 = 0x60
MSR
SPR
Bits 3-0 = Logic 0
Bits 7-4 = Logic levels of the inputs inverted
Bits 7-0 = 0xFF
EMSR
FLVL
Bits 7-0 = 0x00
Bits 7-0 = 0x00
TRG
FC
Bits 7-0 = 0x00
Bits 7-0 = 0x00
FCTR
EFR
XON1
Bits 7-0 = 0x00
Bits 7-0 = 0x00
Bits 7-0 = 0x00
XON2
XOFF1
Bits 7-0 = 0x00
Bits 7-0 = 0x00
XOFF2
FSTAT
I/O SIGNALS
Bits 7-0 = 0x00
Bits 7-0 = 0xFF
RESET STATE
TX
IRTX
Logic 1
Logic 0
RTS#
DTR#
RXRDY#
Logic 1
Logic 1
Logic 1
TXRDY#
INT
IRQ#
Logic 0
XR16C854 = Three-State Condition
XR16C854D = Logic 0
Logic 1 (68 mode, INTSEL = 0)
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REV. 3.0
40