XR16C850CM-F Datasheet, PDF (41/56 Pages) Exar Corporation – 2.97V TO 5.5V UART WITH 128-BYTE FIFO

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REV. 2.3.1
XR16C850
2.97V TO 5.5V UART WITH 128-BYTE FIFO
TABLE 15: UART RESET CONDITIONS
REGISTERS
RESET STATE
DLL
Bits 7-0 = 0xXX
DLM
Bits 7-0 = 0xXX
RHR
Bits 7-0 = 0xXX
THR
Bits 7-0 = 0xXX
IER
Bits 7-0 = 0x00
FCR
Bits 7-0 = 0x00
ISR
Bits 7-0 = 0x01
LCR
Bits 7-0 = 0x00
MCR
Bits 7-0 = 0x00
LSR
Bits 7-0 = 0x60
MSR
Bits 3-0 = Logic 0
Bits 7-4 = Logic levels of the inputs inverted
SPR
Bits 7-0 = 0xFF
EMSR
Bits 7-0 = 0x00
FLVL
Bits 7-0 = 0x00
EFR
Bits 7-0 = 0x00
XON1
Bits 7-0 = 0x00
XON2
Bits 7-0 = 0x00
XOFF1
Bits 7-0 = 0x00
XOFF2
Bits 7-0 = 0x00
FC
Bits 7-0 = 0x00
I/O SIGNALS
RESET STATE
TX
Logic 1
OP1#
Logic 1 (Intel Bus Mode)
OP2#
Logic 1
RTS#
Logic 1
DTR#
Logic 1
RXRDY#
Logic 1 (Intel Bus Mode)
Three-State Condition (PC Mode)
TXRDY#
Logic 0 (Intel Bus Mode)
Three-State Condition (PC Mode)
INT
Logic 0 (Intel Bus Mode)
Three-State Condition (PC Mode)
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