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Getting Started
1.3.2
Selecting UART Source and Optical Transceiver Interface
Figure 1-2 shows two pairs of jumpers used to route signals to and from the MCP2120.
Jumpers J1 and J4 are used to determine the source of the signals used by the UART
interface. When the header has the pins closest to the “DB9” label jumpered to the
center pin, the DB9 is the source of the UART signal. When the header has the pins
closest to the “Header” label jumpered to the center pin, the four-pin header is the
source of the UART signal.
Jumpers J6 and J7 are used to determine the source and destination of the infrared
data signals used by the interface between the MCP2120 and Optical Transceiver.
When the header has the pins closest to the “Integrated Transceiver” label jumpered to
the center pin, the integrated transceiver is used. When the header has the pins closest
to the “Component Transceiver” label jumpered to the center pin, the component
transceiver logic is used.
FIGURE 1-2:
MCP2120 SELECTING SOURCES
R9
D3
D6 D2
U2
C11
R15
C18
C6
R3
J5
C10
U4
R4
D4
C15
CR1
C4
C7
JP4
( MCP2120 )
Open=Enabled
R5
R10 R11
Component
D1
C12
C13
C14
C8
R8
R7
R6
Transceiver
J6 J7
R12
D5
JP5 R1
C9
R14
Q1
R2
U3
C2
JP3:JP1
000 =F OSC /768
001 =F OSC /384
Integrated
Transceiver
U6
J2
C5
C1
U1
C3
010 =F OSC /192
011 =F OSC /128
100 =F OSC /64
111 =S/W Baud
Open=0
R13
C16
J4
MCP2120 Developer’s Board
02-01608 Rev. 1
J1
J3
+5V
GND
These two jumpers select the
source of the Host signals.
J1 and J4
Header is source.
These two jumpers select the
optical transceiver logic. Both jumpers
should connect the same pin positions
J6 and J7
Component Transceiver
DB9 is source.
Integrated Transceiver
? 2005 Microchip Technology Inc.
DS51246C-page 9
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