SUPPORT INFORMATION
6-2
M68HC11EVBU/D
Table 6-2. Terminal I/O Port Connector (P2) Pin Assignments
Pin Number
Signal Mnemonic
Signal Name And Description
1
GND
PROTECTIVE GROUND
2
RXD
RECEIVED DATA – Serial data input line.
3
TXD
TRANSMITTED DATA – Serial data output line.
4
NC
Not connected.
5
CTS
CLEAR TO SEND – An output signal used to indicate ready-to-
transfer data status. This pin is connected to both DSR pin 6 and
DCD pin 8.
6
DSR
DATA SET READY – An output signal used to indicate an on-
line/in-service/active status. This pin is connected to both CTS pin
5 and DCD pin 8.
7
SIG-GND
SIGNAL GROUND – This line provides signal ground or common
return connection (common ground reference) between the EVBU
and RS-232C compatible terminal.
8
DCD
DATA CARRIER DETECT – An output signal used to indicate an
acceptable received line (carrier) signal has been detected. This
pin is connected to both CTS pin 5 and DSR pin 6.
9-19
NC
Not connected.
20
DTR
DATA TERMINAL READY – An input line used to indicate an on-
line/in-service/active status.
21-25
NC
Not connected.
Summary of Contents for M68HC11EVBD
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Page 101: ...SUPPORT INFORMATION M68HC11EVBU D 6 9 Figure 6 2 EVBU Schematic Diagram Sheet 1 of 3 ...
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Page 103: ...SUPPORT INFORMATION M68HC11EVBU D 6 11 Figure 6 2 EVBU Schematic Diagram Sheet 2 of 3 ...
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