S12X Debug (S12XDBGV3) Module
MC9S12XHY-Family Reference Manual Rev. 1.01
Freescale Semiconductor
237
The trigger priorities described in
Table 6-39
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.
6.3.2.7.4
Debug Match Flag Register (DBGMFR)
Read: If COMRV[1:0] = 11
Write: Never
DBGMFR is visible at 0x0027 only with COMRV[1:0] = 11. It features four flag bits each mapped directly
to a channel. Should a match occur on the channel during the debug session, then the corresponding flag
is set and remains set until the next time the module is armed by writing to the ARM bit. Thus the contents
are retained after a debug session for evaluation purposes. These flags cannot be cleared by software, they
are cleared only when arming the module. A set flag does not inhibit the setting of other flags. Once a flag
is set, further triggers on the same channel have no affect.
6.3.2.8
Comparator Register Descriptions
Each comparator has a bank of registers that are visible through an 8-byte window in the S12XDBG
module register address map. Comparators A and C consist of 8 register bytes (3 address bus compare
registers, two data bus compare registers, two data bus mask registers and a control register).
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...Other matches have no effect
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. (No match triggers state sequencer transition)
1111
Reserved. (No match triggers state sequencer transition)
Address: 0x0027
7
6
5
4
3
2
1
0
R
0
0
0
0
MC3
MC2
MC1
MC0
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 6-12. Debug Match Flag Register (DBGMFR)
Table 6-24. State3 — Sequencer Next State Selection
SC[3:0]
Description
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