Serial Port Header J18
http://www.motorola.com/computer/literature
6-15
6
Notes
1. AUTOFD#, INIT#, and SEL_IN# are not supported when
the MPC8xx port is used. They are supported when the
Peripheral I/O controller port is used.
2. BUSY, PERROR, and SEL_OUT are pulled down with
4.7K
Ω
resistors. All other control signals are pulled up with
4.7K
Ω
resistors.
Serial Port Header J18
A 10-pin header (J18 on MBX series boards) provides access to the EIA-
232 serial I/O interface. The pinouts are arranged to permit a direct ribbon
cable connection to a DB9 male connector. The pin assignments are listed
in the following table.
Note
For SMC1, only TXD and RXD are supported.
19
STBI#
GND
20
21
BUSY
GND
22
23
PERROR
GND
24
25
SEL_OUT
Key
26
Table 6-6. Parallel I/O Header Pin Assignments
Pin #
Signal
Signal
Pin #
Table 6-7. Serial I/O Header Pin Assignments
DB9 Pin
(DTE)
Header
Pin
Signal
Signal
Header
Pin
DB9 Pin
(DTE)
1
1
DCD
DSR
2
6
2
3
RXD
RTS
4
7
3
5
TXD
CTS
6
8
4
7
DTR
RI
8
9
5
9
GND
10
Содержание MBX Series
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