10
3.7.5 The Auxiliary Serial Communication Connector J6
The MCF5204 has a built-in UART. This channel is not used by the SBC5204 dBUG and it is available
to the user. The signals of this channel are available on J9 and the they are also run trough RS-232
driver/receivers and are available on J6. The available signals form a working subset of the RS-232C
standard. Table 3.8 shows the pin assignment for J6.
TABLE 3.8. The J6 Connector pin assignment.
PIN NO.
DIRECTION
SIGNAL NAME
1
Output
Connected to pin 6 and 8
2
Output
Receive Data
3
Input
Transmit Data
4
No connect
5
Signal Ground
6
Output
Connected to 1 and 8
7
Input
Clear to Send
8
Output
Request to Send (connected to 1 & 6)
9
Not Used
3.7.6 The Debug Connector J7
The MCF5204 does have background Debug Port, Real-Time Trace Support, and Real-Time Debug
Support. The necessary signals are available at connector J7. Table 3.9 shows the pin assignment.
3.7.7 The Processor Expansion Bus J8 and J9
All the processors signals are available on two burg headers J8 and J9 for future expansion. Although
these signals are not buffered, they can drive at least one TTL load with some having more than one TTL
load capability. User may refer to the data sheets for the major parts and the schematic at the end of this
manual to obtain an accurate loading capability. All the primary signals to/from the processor needed for
expansion are available on J8. Secondary signals (less likely to be used) and I/O signals are available on
J9. Therefore, a single 50-wire flat ribbon cable with the IDC connectors may be used for most of future
expansions. Tables 3.10 and 3.11 show the pin assignment for J8 and J9 respectively.