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| 型号： | MCP2140T-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 47/58页 |
| 文件大小： | 0K |
| 描述： | IC IRDA CONTROLLR DTE/DCE 20SSOP |
| 标准包装： | 1,600 |
| 控制器类型： | IRDA 标准协议栈控制器 |
| 接口： | UART |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 2.2mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
| 配用： | MCP2140DM-TMPSNS-ND - BOARD DEMO FOR MCP2140 |
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2003 Microchip Technology Inc.
Preliminary
DS21790A-page 51
MCP2140
C.2
Discovery Mode
Discovery mode allows the Primary device to deter-
mine the capabilities of the MCP2140 (Secondary
device). Discovery mode is entered once the MCP2140
(Secondary device) has sent an XID response to the
Primary device and the Primary device has completed
sending the XIDs and then sends a Broadcast ID. If this
sequence is not completed, then a Primary and
Secondary device can stay in NDM indefinitely.
When the Primary device has something to do, it
initiates Discovery. Discovery has two parts. They are:
Link initialization
Resource determination
The first step is for the Primary and Secondary devices
to determine, and then adjust to, each other’s hardware
capabilities. These capabilities are parameters like:
Data rate
Turn around time
Number of packets without a response
How long to wait before disconnecting
Both the Primary and Secondary device begin commu-
nications at 9600 baud, which is the default baud rate.
The Primary device sends its parameters, then the
Secondary device responds with its parameters. For
example, if the Primary supports all data rates up to
115.2 kbaud and the Secondary device only supports
9.6 kbaud, the link will be established at 9.6 kbaud.
Once the hardware parameters are established, the
Primary device must determine if the Secondary device
has the resources it requires. If the Primary device has
a job to print, then it must know if it’s talking to a printer,
not a modem or other device. This determination is
made using the Information Access Service (IAS). The
job of the Secondary device is to respond to IAS que-
ries made by the Primary device. The Primary device
must ask a series of questions like:
What is the name of your service?
What is the address of this service?
What are the capabilities of this device?
When all the Primary device’s questions are answered,
the Primary device can access the service provided by
the Secondary device.
C.3
Normal Connect Mode (NCM)
Once discovery has been completed, the Primary
device and Secondary device can freely exchange
data.
Both the Primary device and the Secondary device
check to make sure that data packets are received by
the other without errors. Even when data is required to
be sent, the Primary and Secondary devices will still
exchange packets to ensure that the connection hasn’t,
unexpectedly, been dropped. When the Primary device
has finished, it then transmits the close link command
to the Secondary device. The Secondary device will
confirm the close link command and both the Primary
device and the Secondary device will revert to the NDM
state.
Note:
The MCP2140 is limited to a data rate of
9.6 kbaud.
Note:
If the NCM mode is unexpectedly termi-
nated for any reason (including the Primary
device not issuing a close link command),
the Secondary device will revert to the
NDM state after a time delay (after the last
frame has been received).
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