xr16c2552ij Exar Corporation, xr16c2552ij Datasheet - Page 30

• Manufacturer Part Number: xr16c2552ij
• Description: 2.97v To 5.5v Dual Uart With 16-byte Fifo
• Manufacturer: Exar Corporation

XR16C2552
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
F
F
IGURE
IGURE
RXRDY#
RX
INT
INT*
TXRDY#
IOW#
IOR#
(Reading data
out of RHR)
TX
(Unloading)
(Loading data
into THR)
*INT is cleared when the ISR is read or when data is loaded into the THR.
16. R
17. T
IER[1]
enabled
RANSMIT
ECEIVE
T
WRI
R
T
Start
Start
Bit
WT
R
EADY AND
Bit
EADY
ISR is read
D0:D7
T
& I
D0:D7
SRT
NTERRUPT
I
NTERRUPT
T
WRI
Stop
Stop
Bit
Bit
T
RR
in RHR
1 Byte
Active
Ready
T
T
T
Data
T
T
SSR
SSR
IMING
WT
IMING
[N
ISR is read
[N
T
D0:D7
ON
D0:D7
SRT
ON
30
-FIFO M
-FIFO M
ODE
T
ODE
RR
in RHR
1 Byte
Ready
Active
T
T
Data
]
SSR
SSR
]
FOR
FOR
T
WRI
C
C
HANNELS
HANNELS
T
WT
D0:D7
A & B
A & B
ISR is read
D0:D7
T
SRT
xr
TXNonFIFO
T
RR
T
in RHR
1 Byte
Active
Ready
SSR
T
Data
SSR
RXNFM
REV. 1.0.0