
CPU32+
MC68360 USER’S MANUAL
TP—BERR Frame Type
The TP field defines the class of the faulted bus operation. Two bus error exception frame
types are defined. One is for faults on prefetch and operand accesses, and the other is
for faults during exception frame stacking.
0 = Operand or prefetch bus fault
1 = Exception processing bus fault
MV—MOVEM in Progress
MV is set when the operand transfer portion of the MOVEM instruction is in progress at
the time of a bus fault. If a prefetch bus fault occurs while prefetching the MOVEM opcode
and extension word, both the MV and IN bits will be set.
0 = MOVEM was not in progress when fault occurred
1 = MOVEM was in progress when fault occurred
SZC1,SCZ0—Original Operand Size
The SZC1,SZC0 field specifies the size of the original bus cycle (i.e., the size bits of the
first cycle, when a transaction is divided into two or three cycles due to bus size or operand
address).
00 = Original operand size was long word
01 = Original operand size was byte
10 = Original operand size was word
11 = Unused, reserved
TR—Trace Pending
TR indicates that a trace exception was pending when a bus error exception was pro-
cessed. The instruction that generated the trace will not be restarted upon return from the
exception handler. This includes MOVEM and released write bus errors indicated by the
assertion of either MV or RR in the SSW.
0 = Trace not pending
1 = Trace pending
B1—Breakpoint Channel 1 Pending
B1 indicates that a breakpoint exception was pending on channel 1 (external breakpoint
source) when a bus error exception was processed. Pending breakpoint status is stacked,
regardless of the type of bus error exception.
0 = Breakpoint not pending
1 = Breakpoint pending
B0—Breakpoint Channel 0 Pending
B0 indicates that a breakpoint exception was pending on channel 0 (internal breakpoint
source) when the bus error exception was processed. Pending breakpoint status is
stacked, regardless of the type of bus error exception.
0 = Breakpoint not pending
1 = Breakpoint pending
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.