mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 705

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

19.3.1.7
Each of the state sequencer states 1 to 3 features a dedicated control register to determine if transitions
from that state are allowed depending upon comparator matches or tag hits and to define the next state for
the state sequencer following a match. The 3 debug state control registers are located at the same address
in the register address map (0x0027). Each register can be accessed using the COMRV bits in DBGC1 to
blend in the required register (see
19.3.1.8
Read: Anytime
Write: Anytime when DBG not armed.
This register is visible at 0x0027 only with COMRV[1:0] = 00. The state control register 1 selects the
targeted next state while in State1. The matches refer to the match channels of the comparator match
control logic as depicted in
Register
associated DBGXCTL control register.
Freescale Semiconductor
0x0027
SC[3:0}
Reset
Field
3–0
W
R
(DBGXCTL)”. Comparators must be enabled by setting the comparator enable bit in the
State Control Bits — These bits select the targeted next state while in State1, based upon the match event.
See
The trigger priorities described in
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.
Debug State Control Registers
Debug State Control Register 1 (DBGSCR1)
0
0
7
Table
Unimplemented or Reserved
19-21.
Figure 19-10. Debug State Control Register 1 (DBGSCR1)
0
0
6
Table 19-19. State Control Register Access Encoding
Figure 19-1
COMRV
Table 19-20. DBGSCR1 Field Descriptions
00
01
10
11
Table
MC9S12XDP512 Data Sheet, Rev. 2.17
0
0
5
and described in
19-19).
Table 19-38
Visible State Control Register
0
0
4
dictate that in the case of simultaneous matches, the match on
Description
Section 19.3.1.11.1, “Debug Comparator Control
DBGSCR1
DBGSCR2
DBGSCR3
DBGSCR3
SC3
0
3
SC2
0
2
Chapter 19 Debug (S12XDBGV2)
SC1
0
1
SC0
0
0
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