MC68340AG16VE Freescale Semiconductor, MC68340AG16VE Datasheet - Page 179

• Manufacturer Part Number: MC68340AG16VE
• Description: IC MPU 32BIT 16MHZ 144-LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68340AG16VE

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• No. Of I/o's: 16
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Embedded Interface Type: UART
• Digital Ic Case Style: LQFP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

When the CPU32 completes exception processing, it is ready to begin either exception
processing for a pending exception or execution of a handler routine. Priority assignment
governs the order in which exception processing occurs, not the order in which exception
handlers are executed.
As a general rule, when simultaneous exceptions occur, the handler routines for lower
priority exceptions are executed before the handler routines for higher priority exceptions.
For example, consider the arrival of an interrupt during execution of a TRAP instruction,
while tracing is enabled. Trap exception processing (2) is done first, followed immediately
by exception processing for the trace (4.1), and then by exception processing for the
interrupt (4.3). Each exception places a new context on the stack. When the processor
resumes normal instruction execution, it is vectored to the interrupt handler, which returns
to the trace handler that returns to the trap handler.
There are special cases to which the general rule does not apply. The reset exception will
always be the first exception handled since reset clears all other exceptions. It is also
possible for high-priority exception processing to begin before low-priority exception
processing is complete. For example, if a bus error occurs during trace exception
processing, the bus error will be processed and handled before trace exception
processing is completed.
5-42
Priority
Group/
1.1
1.2
4.1
4.2
4.3
0
2
3
Reset
Address Error
Bus Error
BKPT#n, CHK, CHK2,
Division by Zero, RTE,
TRAP#n, TRAPcc, TRAPV
Illegal Instruction, Line A,
Unimplemented Line F,
Privilege Violation
Trace
Hardware Breakpoint
Interrupt
Freescale Semiconductor, Inc.
Table 5-17. Exception Priority Groups
Relative Priority
For More Information On This Product,
Exception and
MC68340 USER’S MANUAL
Go to: www.freescale.com
Aborts all processing (instruction or
exception); does not save old context.
Suspends processing (instruction or
exception); saves internal context.
Exception processing is a part of
instruction execution.
Exception processing begins before
instruction execution.
Exception processing begins when current
instruction or previous exception
processing is complete.
Characteristics
MOTOROLA