參數(shù)資料
型號(hào): MCP2150
廠商: Microchip Technology Inc.
英文描述: DEVELOPER’S KIT USER’S GUIDE
中文描述: 開發(fā)人員包用戶指南
文件頁數(shù): 13/64頁
文件大?。?/td> 2573K
代理商: MCP2150
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
U
J5
D4
C15
C12
C13
C14
C9
C5
C1
J2
MCP2120
Developer’s Board
02-01608 Rev. 1
U1
D
J1
J4
R14
CR1
C4
C7
C8
R1
Q1
JP5
U3
R2
C2
C3
H
R
T
M
R
J3
+5V
GND
R13
C16
JP3:JP1
000
=F
OSC
/768
001
=F
OSC
/384
010
=F
OSC
/192
011
=F
OSC
/128
100
=F
OSC
/64
=S/W Baud
Open=0
Integrated
Transceiver
U6
R8
R7
R6
R4
JP4
(
MCP2120
)
Open=Enabled
R9
D3
Y
D6 D2
U2
C6
R3
C10
U4
R5
R11
R10
C
Component
Transceiver
J6
J7
R12
D1
D5
C18
R15
C11
These three jumpers select the baud rate:
JP3:JP2:JP1
F
OSC
/768
F
OSC
/384
F
OSC
/192
JP3:JP2:JP1
F
OSC
/128
F
OSC
/64
Software Baud Mode
F
OSC
Frequency (MHz)
BAUD2:BAUD0
0.6144
(1)
2.000
3.6864
4.9152
7.3728
14.7456
(2)
20.000
(2)
Bit Rate
000
001
010
011
100
800
1600
3200
4800
9600
2604
5208
10417
15625
31250
4800
9600
19200
28800
57600
6400
12800
25600
38400
78600
9600
19200
38400
57600
115200
19200
38400
78600
115200
230400
26042
52083
104167
156250
312500
F
OSC
/ 768
F
OSC
/ 384
F
OSC
/ 192
F
OSC
/ 128
F
OSC
/ 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
μ
s in the IrDA standard specification.
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