MC68030RC25C Freescale Semiconductor, MC68030RC25C Datasheet - Page 290

• Manufacturer Part Number: MC68030RC25C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030RC25C

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

8.1.12 Multiple Exceptions
MOTOROLA
When several exceptions occur simultaneously, they are processed according
to a fixed priority. Table 8-5 lists the exceptions, grouped by characteristics.
As soon as the MC68030 has completed exception processing for a condition
few combinations of the exceptions shown in Table 8-5 can be pending
Each group has a priority from 0-4. Priority 0 has the highest priority.
when another exception is pending, it begins exception processing for the
pending exception instead of executing the exception handler for the original
exception condition. Also, whenever a bus error or address error occurs, its
exception processing takes precedence over lower priority exceptions and
occurs immediately. For example, if a bus error occurs during the exception
executes its handler before completing the trace exception processing. How-
ever, most exceptions cannot occur during exception processing, and very
simultaneously.
processing for a trace condition, the system processes the bus error and
PIPE STAGE D ~
EXECUTE INSTRUCTION WORD
(
INSTRUCTION WORD ON DATA BUS
,x,, )
Figure 8-7. Breakpoint Instruction Flowchart
Y
I
MC68030 USER'S MANUAL
DSACKx OR STERM
A2-A4 ~
~
I INITIATE READ BUS CYCLE I
~_~
A16-A19 ~
BREAKPOINT NUMBER
ENTRY
)
I
$0
RMINj T ED WITH
BERR
~., TAKE &LEGAl INSTRUCTION~' ~
EXCEPTION
,.,,/
8-23
8