Chapter 20 S12X Debug (S12XDBGV3) Module
MC9S12XDP512 Data Sheet, Rev. 2.17
Freescale Semiconductor
759
20.3.2.7.1
Debug State Control Register 1 (DBGSCR1)
Read: Anytime
Write: Anytime when S12XDBG not armed.
This register is visible at 0x0027 only with COMRV[1:0] = 00. The state control register 1 selects the
targeted next state whilst in State1. 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 20-38 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
nal state has priority over all other matches.
Address: 0x0027
76543210
R
0000
SC3
SC2
SC1
SC0
W
Reset
00000000
= Unimplemented or Reserved
Figure 20-9. Debug State Control Register 1 (DBGSCR1)
Table 20-20. DBGSCR1 Field Descriptions
Field
Description
3–0
SC[3:0]
These bits select the targeted next state whilst in State1, based upon the match event.
Table 20-21. State1 Sequencer Next State Selection
SC[3:0]
Description
0000
Any match triggers to state2
0001
Any match triggers to state3
0010
Any match triggers to Final State
0011
Match2 triggers to State2....... Other matches have no effect
0100
Match2 triggers to State3....... Other matches have no effect
0101
Match2 triggers to Final State....... Other matches have no effect
0110
Match0 triggers to State2....... Match1 triggers to State3....... Other matches have no effect
0111
Match1 triggers to State3....... Match0 triggers Final State....... Other matches have no effect
1000
Match0 triggers to State2....... Match2 triggers to State3....... Other matches have no effect
1001
Match2 triggers to State3....... Match0 triggers Final State....... Other matches have no effect
1010
Match1 triggers to State2....... Match3 triggers to State3....... Other matches have no effect
1011
Match3 triggers to State3....... Match1 triggers to Final State....... Other matches have no effect
1100
Match3 has no effect....... All other matches (M0,M1,M2) trigger to State2
1101
Reserved
1110
Reserved
1111
Reserved