Section 29 User Break Controller (UBC)
Rev.1.00 Dec. 13, 2005 Page 1127 of 1286
REJ09B0158-0100
29.4
User Break Debugging Support Function
By using the user break debugging support function, the branch destination address can be
modified when the CPU accepts the user break request. Specifically, setting the UBDE bit of
break control register CBCR to 1 allows branching to the address indicated by DBR instead of
branching to the address indicated by the [VBR
+
offset]. Figure 29.2 shows the flowchart of the
user break debugging support function.
SPC
←
PC
SSR
←
SR
SR.BL
←
B'1
SR.MD
←
B'1
SR.RB
←
B'1
Exception/interrupt
is generated
Exception
Exception/interrupt/trap?
Trap
Interrupt
PC
←
H'A000 0000
PC
←
VBR +
vector offset
Execute RTE instruction
PC
←
SPC
SR
←
SSR
SGR
←
R15
PC
←
DBR
Debugging program
R15
←
SGR
(STC instruction)
Reset exception?
(CBCR.UBDE == 1)
&& (user break)?
Exception operation ends
INTEVT
←
Interrupt code
EXPEVT
←
Exception code
Yes
No
No
Yes
Hardware operations
Exception handling routine
TRA
←
TRAPA (imm)
EXPEVT
←
H'160
Figure 29.2 Flowchart of User Break Debugging Support Function
Содержание SH7780 Series
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Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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Страница 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
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