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| 型號： | MCP2150DM |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 11/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DEMO FOR MCP2150 |
| 標準包裝： | 1 |
| 主要目的： | 接口，IrDA |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MCP2150 |
| 主要屬性： | 帶 PIC18F MCU 的 IrDA 控制器 |
| 次要屬性： | USB 接口 |
| 已供物品： | 板 |
| 產(chǎn)品目錄頁面： | 685 (CN2011-ZH PDF) |
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2002 Microchip Technology Inc.
Preliminary
DS21655B-page 19
MCP2150
2.11
Turnaround Latency
An IR link can be compared to a one-wire data connec-
tion. The IR transceiver can transmit or receive, but not
both at the same time. A delay of one bit time is recom-
mended between the time a byte is received and
another byte is transmitted.
2.12
IR Port Baud Rate
The baud rate for the MCP2150 IR port (the TXIR and
RXIR pins) is, initially, at the default rate of 9600 baud.
The Primary device determines the maximum baud
rate that the MCP2150 will operate at. This information
is used during NDM, with the Primary device setting the
baud rate of the IR link. The maximum IR baud rate is
not required to be the same as the MCP2150’s serial
port (UART) baud rate (as determined by the
BAUD1:BAUD0 pins).
2.13
Programmable Device ID
The MCP2150 has a flexible feature that allows the
MCP2150 Device ID to be changed by the Host Con-
troller. The default ID is “Generic IrDA” and is stored in
non-volatile, electrically erasable programmable mem-
ory (EEPROM). The maximum ID String length is 19
bytes. The format of the ID EEPROM is shown in
The ID String must only contain the ASCII characters
from 20h to 7Ah (inclusive).
The MCP2150 enters into ID String programming when
it exits the reset state and detects that the DTR pin is
high and the RTS pin is low.
A Host Controller connected to the MCP2150 would,
typically, perform the following steps to place the
MCP2150 into ID String programming mode:
1.
Force the MCP2150 into reset (RESET pin
forced low).
2.
Force the DTR pin high and the RTS pin low.
3.
Release the MCP2150 from reset (RESET pin
forced high).
4.
Wait for device to complete initialization.
TABLE 2-5:
DTR/RTS STATE & DEVICE
MODE
Once the MCP2150 is ready to receive data, the CTS
pin will be forced low. Data may now be transferred, fol-
lowing the format in Figure 2-11. The CTS pin deter-
mines the flow control and the Host Controller must
monitor this signal to ensure that the data byte may be
sent.
Once the Host Controller has sent its last byte, the DTR
pin must be set low. This ensures that, if another reset
occurs, the MCP2150 will not reenter ID String pro-
gramming mode. The MCP2150 uses the String Length
(1st byte transmitted) to determine when the ID String
programming mode has completed. This returns the
MCP2150 to normal operation.
Example 2-1 shows the firmware code for a
PIC16CXXX acting as the Host Controller to modify the
MCP2150 Device ID String.
FIGURE 2-11:
ID STRING FORMAT
DTR
RTS
After Device Reset *
0X
Enter Normal Mode
10
Enter Programmable Device ID
11
Enter Normal Mode
* Until device initialization is complete.
Note 1: If a non-valid ID String (containing an ASCII
character not in the valid range) is
programmed, the MCP2150 will not create
a link with a Primary device.
2: The communication program supplied with
Microsoft’s Windows operating system
(called HyperTerminal) may leave the DTR
signal high and the RTS signals low when
the program disconnects, or is closed. Care
should be taken to ensure that this does not
accidently cause the MCP2150 to enter
Device ID String Programming.
Length
ID String
1 Byte
1 to 19 Bytes
1st Byte
Transferred
Last Byte
Transferred
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