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Chapter 16 S12X Debug (S12XDBGV3) Module
MC9S12XF - Family Reference Manual, Rev.1.19
Freescale Semiconductor
773
16.3.2.7.3
Debug State Control Register 3 (DBGSCR3)
Read: If COMRV[1:0] = 10
Write: If COMRV[1:0] = 10 and S12XDBG is not armed.
This register is visible at 0x0027 only with COMRV[1:0] = 10. The state control register three selects the
targeted next state whilst in State3. The matches refer to the match channels of the comparator match
enabled by setting the comparator enable bit in the associated DBGXCTL control register.
The trigger priorities described in
Table 16-41 dictate that in the case of simultaneous matches, the match
on the lower channel number (0,1,2,3) has priority. The SC[3:0] encoding ensures that a match leading to
final state has priority over all other matches.
Address: 0x0027
76543210
R
0000
SC3
SC2
SC1
SC0
W
Reset
0
00000
= Unimplemented or Reserved
Figure 16-11. Debug State Control Register 3 (DBGSCR3)
Table 16-25. DBGSCR3 Field Descriptions
Field
Description
3–0
SC[3:0]
These bits select the targeted next state whilst in State3, based upon the match event.
Table 16-26. State3 — Sequencer Next State Selection
SC[3:0]
Description
0000
Any match triggers to state1
0001
Any match triggers to state2
0010
Any match triggers to Final State
0011
Match0 triggers to State1....... Other matches have no effect
0100
Match0 triggers to State2....... Other matches have no effect
0101
Match0 triggers to Final State.......Match1 triggers to State1
0110
Match1 triggers to State1....... Other matches have no effect
0111
Match1 triggers to State2....... Other matches have no effect
1000
Match1 triggers to Final State....... Other matches have no effect
1001
Match2 triggers to State2....... Match0 triggers to Final State....... Other matches have no effect
1010
Match1 triggers to State1....... Match3 triggers to State2....... Other matches have no effect
1011
Match3 triggers to State2....... Match1 triggers to Final State....... Other matches have no effect
1100
Match2 triggers to Final State....... Other matches have no effect
1101
Match3 triggers to Final State....... Other matches have no effect
1110
Reserved
1111
Reserved