MCP2120/MCP2150 USER鈥橲 GUIDE
2.3.1.3
UART Mode
Figure 2.4 shows the jumper which determines if the MCP2120 Developer鈥檚
Board is to be used in Hardware Baud operation, or Software Baud operation.
When in Software Baud operation, an additional signal is required, Request
To Send (RTS), which is used to drive the RESET pin low to cause a change
of baud rate to occur.
Figure 2.4: MCP2120 UART
R9
D3
D6 D2
C17
C11
U2
C18
C6
R3
Y1
J5
CR1
D4
C15
C4
C7
C12
C13
C14
JP5 R1
Q1
U3
C9
C5
C1
R14
R2
C2
JP3:JP1
000=F
OSC
/768
001=F
OSC
/384
010=F
OSC
/192
011=F
OSC
/128
100=F
OSC
/64
111=S/W
Baud
Open=0
MODE
RTS
Integrated
Transceiver
R13
C16
U6
C8
C10
R4
JP4
R10
U4
R5
R11
D1
D5
R12
R15
U5
(MCP2120)
Open=Enabled
R8
R7
R6
Component
Transceiver
J7
J6
C3
DB9
RX
J2
MCP2120
Developer鈥檚 Board
02-01608 Rev. 1
TX
J4
J1
Header
U1
J3
+5V
GND
PC UART configuration for Hardware/Software Baud mode
Hardware Baud Selection
Software Baud Selection
DS51246A-page 10
錚?/div>
2001 Microchip Technology Inc.
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