MC912DG128ACPVE Datasheet, PDF (412/478 Pages) Freescale Semiconductor, Inc – Upward compatible with M68HC11 instruction set

Freescale Semiconductor, Inc.
Development Support
20.4.5.5 CCRSAV
The CCRSAV register is used to save the CCR of the users program
when entering BDM. It is also used for temporary storage in the BDM
firmware.
Read and write: all modes
CCRSAV— BDM CCR Holding Register
RESET:
NOTE 1 ⁽¹⁾
BIT 7
CCR7
X
6
CCR6
X
5
CCR5
X
4
CCR4
X
3
CCR3
X
2
CCR2
X
1
CCR1
X
BIT 0
CCR0
X
$FF06
1. Initialized to equal the CPU12 CCR register by the firmware.
20.5 Breakpoints
Hardware breakpoints are used to debug software on the
MC68HC912DT128A by comparing actual address and data values to
predetermined data in setup registers. A successful comparison will
place the CPU in background debug mode (BDM) or initiate a software
interrupt (SWI). Breakpoint features designed into the
MC68HC912DT128A include:
• Mode selection for BDM or SWI generation
• Program fetch tagging for cycle of execution breakpoint
• Second address compare in dual address modes
• Range compare by disable of low byte address
• Data compare in full feature mode for non-tagged breakpoint
• Byte masking for high/low byte data compares
• R/W compare for non-tagged compares
• Tag inhibit on BDM TRACE
Technical Data
412
MC68HC912DT128A — Rev 4.0
Development Support
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