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Installation and Operation
TABLE 2-7:
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 from 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:
? 2006 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.
DS51591A-page 25
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