XR16L651CM EXAR [Exar Corporation], XR16L651CM Datasheet - Page 8

• Manufacturer Part Number: XR16L651CM
• Description: 2.25V TO 5.5V UART WITH 32-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

XR16L651
2.25V TO 5.5V UART WITH 32-BYTE FIFO
The host interface is 8 data bits wide with 3 address lines and control signals to execute bus read and write
transactions. The 651 supports 3 type of host interfaces: Intel, Motorola and PC mode. The Intel and Motorola
interfaces provide support for their respective microcontroller or processor. This facilitates the hardware design
and interconnections. The Intel bus interface is selected by connecting IM# to logic 0 and PCMODE# to logic 1.
The Intel bus interconnections are shown in
connected to logic 1 and PCMODE# input ties to logic 1. The Motorola bus interconnections are shown in
Figure
interconnections are shown in
T
2.0 FUNCTIONAL DESCRIPTIONS
2.1
4. The special PC mode is selected when IM# and PCMODE# are connected to logic 0. The PC mode
Host Data Bus Interface
F
IGURE
R E S E T
IO W *
A 2
IO R *
C S #
IN T
D 1
D 2
D 3
D 4
D 5
D 6
D 7
A 0
D 0
A 1
3. XR16L651 I
Figure
5.
NTEL
B
Figure
US
I
NTERCONNECTIONS
8
3. The Motorola bus is selected with the IM# input
IO W #
IO R #
C S 2 #
R E S E T
IN T
D 0
D 1
D 2
D 3
D 4
D 5
D 6
D 7
A 0
A 1
A 2
B A U D O U T #
P C M O D E #
G N D
R C L K
D S R #
D T R #
R T S #
O P 2 #
IO W
IO R
A S #
V C C
C S 0
C T S #
O P 1 #
C S 1
C D #
IM #
R X
R I#
T X
V C C
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