xr16m890 Exar Corporation, xr16m890 Datasheet - Page 58

• Manufacturer Part Number: xr16m890
• Description: Uart With 128-byte Fifo And Integrated Level Shifters
• Manufacturer: Exar Corporation

XR16M890
UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
F
F
IGURE
IGURE
RXRDY#
INT*
IOW#
RX
INT
(Unloading)
TXRDY#
(Loading data
into THR)
IOR#
(Reading data
out of RHR)
TX
*INT is cleared when the ISR is read or when data is loaded into the THR.
26. R
27. T
IER[1]
enabled
RANSMIT
ECEIVE
T
WRI
R
T
Start
Start
Bit
WT
R
EADY
Bit
EADY
& I
ISR is read
D0:D7
T
& I
D0:D7
SRT
NTERRUPT
NTERRUPT
T
WRI
Stop
Stop
Bit
Bit
T
RR
T
in RHR
1 Byte
Ready
Active
IMING
T
T
T
Data
T
IMING
SSR
SSR
WT
PRELIMINARY
[N
[N
ISR is read
ON
T
ON
D0:D7
D0:D7
SRT
58
-FIFO M
-FIFO M
ODE
ODE
T
RR
in RHR
1 Byte
]
Active
Ready
T
T
Data
]
SSR
SSR
T
WRI
T
WT
D0:D7
ISR is read
D0:D7
T
SRT
TXNonFIFO
T
RR
T
in RHR
1 Byte
Active
Ready
SSR
T
Data
SSR
RXNFM
REV. P1.1.1