Test Signals - Freescale Semiconductor MCF54455 Reference Manual

Signal Descriptions
2.3.19

Test Signals

Table 2-22 describes test signals reserved for factory testing.
Signal Name
Test
PLL Test
2-20
Table 2-21. Processor Status
PST[3:0]
0000 Continue execution
0001 Begin execution of one instruction
0010 Reserved
0011 Entry into user mode
0100 Begin execution of PULSE and WDDATA instructions
0101 Begin execution of taken branch
0110 Reserved
0111 Begin execution of RTE instruction
1000 Begin one-byte transfer on PSTDDATA
1001 Begin two-byte transfer on PSTDDATA
1010 Begin three-byte transfer on PSTDDATA
1011 Begin four-byte transfer on PSTDDATA
1100 Exception processing
1101 Reserved
1110 Processor is stopped
1111 Processor is halted
Table 2-22. Test Signals
Abbreviation
TEST Reserved for factory testing only and in normal modes of operation
should be connected to VSS to prevent unintentional activation of test
functions.
PLL_TEST Reserved for factory testing only and should be treated as a
no-connect (NC).
Processor Status
Function I/O
I
O
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