PC912XDP512F0MPVR datasheet(703/1348 Pages) FREESCALE

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Chapter 19 S12X Debug (S12XDBGV2) Module

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

705

19.3.1.7

Debug State Control Registers

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 Table 19-19).

19.3.1.8

Debug State Control Register 1 (DBGSCR1)

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 Figure 19-1 and described in Section 19.3.1.11.1, “Debug Comparator Control

associated DBGXCTL control register.

Table 19-19. State Control Register Access Encoding

COMRV

Visible State Control Register

DBGSCR1

DBGSCR2

DBGSCR3

0x0027

76543210

0000

SC3

SC2

SC1

SC0

Reset

00000000

Unimplemented or Reserved

Figure 19-10. Debug State Control Register 1 (DBGSCR1)

Table 19-20. DBGSCR1 Field Descriptions

Field

Description

3–0

SC[3:0}

State Control Bits — These bits select the targeted next state while in State1, based upon the match event.

See Table 19-21.

The trigger priorities described in Table 19-38 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.

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