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XR16M752IL32 Datasheet(PDF) 10 Page - Exar Corporation

Part # XR16M752IL32
Description  HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR16M752IL32 Datasheet(HTML) 10 Page - Exar Corporation

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XR16M752/XR68M752
10
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
REV. 1.1.1
2.0 FUNCTIONAL DESCRIPTIONS
2.1
CPU Interface
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The XR16M752 data interface supports the Intel compatible types of CPUs while the
XR68M752 supports both the Intel and Motorola compatible data interfaces. No clock (oscillator nor external
clock) is required to operate a data bus transaction. Each bus cycle is asynchronous using CS#, IOR# and
IOW# signals. Both UART channels share the same data bus for host operations. The data bus
interconnections are shown in Figure 4.
FIGURE 4. XR16M752/XR68M752 DATA BUS INTERCONNECTIONS
VCC
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CSA#
UART_CSB#
IOR#
IOW #
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR #
IOW #
UART
Channel A
UART
Channel B
UART_INTB
UART_INTA
INTB
INTA
RXRDYA#
TXRDYA#
RXRDYA#
TXRDYA#
RXRDYB#
TXRDYB#
RXRDYB#
TXRDYB#
UART_RESET
RESET
Serial Interface of
RS-232, RS-422
or RS-485
Serial Interface of
RS-232, RS-422
or RS-485
(no connect)
(no connect)
2.25 to 3.6 Volt VCC
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CS#
A3
R/W #
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR #
IOW #
UART
Channel A
UART
Channel B
UART_IRQ#
INTB
INTA
RXRDYA#
TXRDYA#
RXRDYA#
TXRDYA#
RXRDYB#
TXRDYB#
RXRDYB#
TXRDYB#
RESET#
VCC
UART_RESET#
(no connect)
(no connect)
(no connect)
VCC
Intel Data Bus Interconnections
Motorola Data Bus Interconnections
Serial Interface of
RS-232, RS-422
or RS-485
Serial Interface of
RS-232, RS-422
or RS-485


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