MC68HC912BD32 Datasheet, PDF (251/292 Pages) Freescale Semiconductor, Inc – Advance Information

CCRSAV
Freescale Semiconductor, Inc.
Development Support
Breakpoints
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
1. Initialized to equal the CPU12 CCR register by the firmware.
2
CCR2
X
1
CCR1
X
BIT 0
CCR0
X
$FF06
Breakpoints
Hardware breakpoints are used to debug software on the
MC68HC912BD32 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 BDM256 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
17-dev
Development Support
For More Information On This Product,
Go to: www.freescale.com
MC68HC912BD32 Rev 1.0