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MCP2120 数据表(PDF) 13 Page - Microchip Technology

部件名 MCP2120
功能描述  DEVELOPER?셎 KIT USER?셎 GUIDE
PDF  64 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP2120 数据表(HTML) 13 Page - Microchip Technology

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 2001 Microchip Technology Inc.
DS51246A-page 9
Getting Started
2.3.1.2
Selecting Baud Rate
Figure 2.3 shows the three Baud Rate Select Jumpers (JP3:JP1) and the
baud rate formula that is specified (baud rate dependant on MCP2120
operational frequency). Table 2.1 shows the baud rates for some crystal
frequencies.
Figure 2.3: MCP2120 Baud Rate
Table: 2.1 Hardware Baud Rate Selection vs. Frequency
J5
D4
C15
C12
C13
C14
C9
C5
C1
J2
MCP2120 Developer’s Board
02-01608 Rev. 1
U1
J1
J4
R14
CR1
C4
C7
C8
R1
Q1
JP5
U3
R2
C2
C3
J3
+5V
GND
R13
C16
JP3:JP1
000
=FOSC/768
001
=FOSC/384
010
=FOSC/192
011
=FOSC/128
100
=FOSC/64
111
=S/W Baud
Open=0
Integrated
Transceiver
U6
R8
R7
R6
R4
JP4
(MCP2120)
Open=Enabled
R9
D3
D6 D2
U2
C6
R3
C10
U4
R5
R11
R10
Component
Transceiver
J7
J6
R12
D1
D5
C18
R15
C11
These three jumpers select the baud rate:
JP3:JP2:JP1
FOSC/768
FOSC/384
FOSC/192
JP3:JP2:JP1
FOSC/128
FOSC/64
Software Baud Mode
FOSC Frequency (MHz)
BAUD2:BAUD0
0.6144 (1)
2.000
3.6864
4.9152
7.3728
14.7456 (2)
20.000 (2)
Bit Rate
000
800
2604
4800
6400
9600
19200
26042
FOSC / 768
001
1600
5208
9600
12800
19200
38400
52083
FOSC / 384
010
3200
10417
19200
25600
38400
78600
104167
FOSC / 192
011
4800
15625
28800
38400
57600
115200
156250
FOSC / 128
100
9600
31250
57600
78600
115200
230400
312500
FOSC / 64
Note 1: An external clock is recommended for frequencies below 2 MHz.
Note 2: For frequencies above 7.5 MHz, the TXIR pulse width (MCP2120 Data Sheet, Electrical Specification, parameter
IR121) will be shorter than the minimum pulse width of 1.6
µs in the IrDA standard specification.



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