Motorola CPU32 Reference Manual page 262

5.3.1.1 Type 0000 - Breakpoint
This CPU space type is used for breakpoint acknowledge.
31 5 4 2 1 0
I
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
I
BKPT #
I
T
I
0
I
BKPT# field A[ 4:2] indicates the breakpoint number. Software breakpoints set
this value to the number of the executing breakpoint instruction. Hardware
breakpoints always set BKPT# to 7 (%111).
T bit A 1 designates the type of breakpoint. T
=
0 indicates a software
breakpoint; T = 1 indicates a hardware breakpoint.
5.3.1.2 Type 0001 - MMU Access
This type of access is not supported by the CPU32 processor. This space is
reserved for future use.
5.3.1.3 Type 0010 - Coprocessor Access
This type of access is not supported by the CPU32 processor. This space is
reserved for future use.
5.3.1.4 Type 0011 - Internal Register Access
Type 0011 space is used to access certain critical system configuration or
control registers.
The CPU32 external bus interface interrupt mask register resides in CPU space.
This register is written to when LPSTOP is executed, and masks off external
interrupts while in stop mode. A[3:1] indicate the encoded interrupt mask level.
31
18
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
o
0 0 0 0 0 0 0 0 0 1
15 3 2 1
CPU32 REFERENCE MANUAL PROCESSING STATES
MOTOROLA
5-5
II