XR16L570 Exar Corporation, XR16L570 Datasheet - Page 6

• Manufacturer Part Number: XR16L570
• Description: SMALLEST 1.62V TO 5.5V UART
• Manufacturer: Exar Corporation

XR16L570
SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The L570 data interface supports the Intel compatible types of CPUs and it is compatible to
the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data bus
transaction. Each bus cycle is asynchronous using CS#, IOR# and IOW# inputs. A typical data bus
interconnection is shown in
F
2.0 FUNCTIONAL DESCRIPTIONS
2.1
IGURE
UART_RESET
UART_CS#
UART_INT
3. XR16L570 T
CPU Interface
IOW#
IOR#
A0
A1
A2
D0
D1
D2
D3
D4
D5
D6
D7
YPICAL
Figure
D
ATA
3.
B
US
Data Bus Interconnections
I
NTERCONNECTIONS
6
A0
A1
A2
IOR#
IOW#
CS#
INT
RESET
D0
D1
D2
D3
D4
D5
D6
D7
PwrSave
RTS#
CTS#
GND
VCC
RX
TX
VCC
xr
RS-232 or RS-422
Serial Interface of
REV. 1.0.0