S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 8 S12X Debug (S12XDBGV3) Module
Table 8-5. DBGC1 Field Descriptions (continued)
Field
5
XGSBPE
Description
XGATE S/W Breakpoint Enable
— The XGSBPE bit controls whether an XGATE S/W breakpoint request is
passed to the CPU12X. The XGATE S/W breakpoint request is handled by the S12XDBG module, which can
request an CPU12X breakpoint depending on the state of this bit.
0 XGATE S/W breakpoint request is disabled
1 XGATE S/W breakpoint request is enabled
Background Debug Mode Enable
— This bit determines if an S12X breakpoint causes the system to enter
Background Debug Mode (BDM) or initiate a Software Interrupt (SWI). If this bit is set but the BDM is not enabled
by the ENBDM bit in the BDM module, then breakpoints default to SWI.
0 Breakpoint to Software Interrupt if BDM inactive. Otherwise no breakpoint.
1 Breakpoint to BDM, if BDM enabled. Otherwise breakpoint to SWI
S12XDBG Breakpoint Enable Bits
— The DBGBRK bits control whether the debugger will request a breakpoint
to either CPU12X or XGATE or both upon reaching the state sequencer Final State. If tracing is enabled, the
breakpoint is generated on completion of the tracing session. If tracing is not enabled, the breakpoint is
generated immediately. Please refer to
Section 8.4.7
for further details. XGATE software breakpoints are
independent of the DBGBRK bits. XGATE software breakpoints force a breakpoint to the CPU12X independent
of the DBGBRK bit field configuration. See
Comparator Register Visibility Bits
— These bits determine which bank of comparator register is visible in the
8-byte window of the S12XDBG module address map, located between 0x0028 to 0x002F. Furthermore these
bits determine which register is visible at the address 0x0027. See
Table 8-7.
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: S12XE products in 208 MAPBGA packages
4
BDM
3–2
DBGBRK
1–0
COMRV
Table 8-6. DBGBRK Encoding
DBGBRK
00
01
10
11
Resource Halted by Breakpoint
No breakpoint generated
XGATE breakpoint generated
CPU12X breakpoint generated
Breakpoints generated for CPU12X and XGATE
Table 8-7. COMRV Encoding
COMRV
00
01
10
11
Visible Comparator
Comparator A
Comparator B
Comparator C
Comparator D
Visible Register at 0x0027
DBGSCR1
DBGSCR2
DBGSCR3
DBGMFR
MC9S12XE-Family Reference Manual Rev. 1.19
Freescale Semiconductor
309
