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Installation and Operation
TABLE 2-11:
MCP2155 HOST UART INTERFACE PINS
TX
RX
RI
Pin
Name
Pin
Number
(PDIP)
8
9
10
Pin
Type
I
O
I
Buffer
Type
TTL
—
TTL
Description
Asynchronous receive; from Host Controller UART.
Asynchronous transmit; to Host Controller UART.
Ring Indicator. The state of this bit is
communicated to the IrDA ? standard Primary
device.
1 = No Ring Indicate Present.
0 = Ring Indicate Present.
DSR
11
O
—
Data Set Ready. Indicates that the MCP2150 has
established a valid IrDA standard link with a
Primary device. This signal is locally emulated and
not related to the DTR bit of the IrDA standard
Primary device. ( Note 1 )
1 = An IR link has not been established
(No IR Link).
0 = An IR link has been established (IR link).
DTR
12
I
TTL
Data Terminal Ready. Indicates that the embedded
device connected to the MCP2150 is ready for IR
data. The state of this bit is communicated to the
IrDA standard Primary device, via the IrDA
standard DSR bit carried by IrCOMM.
1 = Embedded device not ready.
0 = Embedded device ready.
CTS
13
O
—
Clear-to-Send. Indicates that the MCP2150 is
ready to receive data form the Host Controller. This
signal is locally emulated and not related to the
CTS/RTS bit of the IrDA standard Primary device.
1 = Host Controller should not send data.
0 = Host Controller may send data.
RTS
14
I
TTL
Request-to-Send. Indicates that a Host Controller
is ready to receive data from the MCP2150. This
signal is locally emulated and not related to the
CTS/RTS bit of the IrDA standard Primary device.
1 = Host Controller not ready to receive data.
0 = Host Controller ready to receive data.
CD
19
I
ST
Carrier Detect. The state of this bit is communi-
cated to the IrDA standard Primary device via the
IrDA standard CD bit.
1 = No Carrier Present.
0 = Carrier Present.
Legend: TTL = TTL compatible input ST = Schmitt Trigger input with CMOS levels
I = Input O = Output
Note 1:
? 2004 Microchip Technology Inc.
The state of the DTR output pin does not reflect the state of the DTR bit of the IrDA
standard Primary device.
DS51516A-page 41
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