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Chapter 20 S12X Debug (S12XDBGV3) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

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

control logic as depicted in Figure 20-1 and described in Section 20.3.2.8.1”. Comparators must be

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

ﬁnal state has priority over all other matches.

Address: 0x0027

76543210

0000

SC3

SC2

SC1

SC0

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

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