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| 型號： | MCP2140 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | IrDA Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate(固定波特率,低成本,IrDA標準協(xié)議編譯碼器) |
| 中文描述： | 標準的IrDA協(xié)議?？刂破?，固定通信速率9600波特（固定波特率，低成本，紅外標準協(xié)議編譯碼器） |
| 文件頁數(shù)： | 15/58頁 |
| 文件大小： | 1001K |
| 代理商： | MCP2140 |
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2003 Microchip Technology Inc.
Preliminary
DS21790A-page 15
MCP2140
2.10
Buffers and Throughput
The IR data rate of the MCP2140 is fixed at 9.6 kbaud.
The actual throughput will be less due to several fac-
tors. The most significant factors are under the control
of the developer. One factor beyond the control of the
designer is the overhead associated with the IrDA
standard. A throughput example is shown in
Table 2-4
.
Figure 2-9 shows the CTS waveform, what the state of
the buffers can be and the operation of the Host UART
and IR interfaces.
Figure 2-10 shows the screen-capture of a Host Con-
troller transmitting 240 bytes. Data is not transmitted
after CTS goes high (so only a maximum of 23 bytes of
the 29 byte buffer are utilized). Between data packets,
the CTS time can vary, depending on the Primary
Device (see blue circled CTS pulse in Figure 2-10).
TABLE 2-4:
THROUGHPUT
FIGURE 2-9:
HOST UART RECEIVE BUFFER AND CTS WAVEFORM
FIGURE 2-10:
HOST CONTROLLER TRANSMISSION OF A 240 BYTE PACKET
Bytes
Transferred
(3)
Bytes/
CTS Low
Time (S)
Effective
Baud Rate
240
240
23 (max)
(1)
0.810133
29
2962
(1)
3692
(2)
0.6500
Note 1:
Measured from Figure 2-10.
2:
Interpolated from Figure 2-10.
3:
10 bits transferred for each byte.
Note:
IrDA throughput is based on many factors
associated with characteristics of the Pri-
mary and Secondary devices. These char-
acteristics may cause your throughput to
be more or less than is shown in Table 2-4.
CTS
Receive Buffer Empty
MCP2140
Can Receive Data Receive Buffer Has 22 Bytes,
CTS Pin Driven High
Receive Buffer
Full (29 Bytes)
Receive Buffer Empty
MCP2140
Can Receive Data
IR Data Packet Starts Transmission
IR Data Packet Transmitted
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