Datasheet

Breakpoint (BKP) Module
MC9S12DP256 — Revision 1.1
Breakpoint (BKP) Module
There are two types of breakpoints: tagged and forced. Forced
breakpoints occur at the next instruction boundary if a match occurs and
tagged breakpoints allow breaking just before a specific instruction
executes. Tagged breakpoints will only occur on addresses. Tagging on
data is not allowed; however, if this occurs, nothing will occur within the
BKP module.
The breakpoint module allows breaking within a 256 byte address range
and/or within expanded memory, allows matching of the data bus as well
as address matching, allows breakpoints to match 8 bit or 16 bit data,
and allows forced breakpoints to match on a read or write cycle.
Features
• Full or Dual Breakpoint Mode
– Compare on address and data (Full)
– Compare on either of two addresses (Dual)
• BDM or SWI Breakpoint
– Enter BDM on breakpoint (BDM)
– Execute SWI on breakpoint (SWI)
• Tagged or Forced Breakpoint
– Break just before a specific instruction will begin execution
(TAG)
– Break on the first instruction boundary after a match occurs
(Force)
• Single, Range, or Page address compares
– Compare on address (Single)
– Compare on address 256 byte (Range)
– Compare on any 16K Page (Page)
• Compare address on read or write on forced breakpoints
• High and/or low byte data compares
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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