MC68030RC25C Freescale Semiconductor, MC68030RC25C Datasheet - Page 118

• 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: -

SECTION 4
MOTOROLA
This section describes the processing states of the MC68030. It describes the
functions of the bits in the supervisor portion of the status register and the
The processor enters the exception processing state when an interrupt is
the exceptions.
actions taken by the processor in response to exception conditions.
Unless the processor has halted, it is always in either the normal or the
exception processing state. Whenever the processor is executing instructions
or fetching instructions or operands, it is in the normal processing state. The
some other exceptional condition arises. Execution of certain instructions or
cause exceptions. External conditions, such as interrupts, bus errors, and
some coprocessor responses, also cause exceptions. Exception processing
A catastrophic system failure occurs whenever the processor receives a bus
This type of failure halts the processor. For example, if during the exception
completed the transition to normal processing and has not completed saving
the internal state of the machine, so the processor assumes that the system
PROCESSING STATES
processor is also in the normal processing state while it is storing instruction
results or communicating with a coprocessor.
acknowledged, when an instruction is traced or results in a trap, or when
unusual conditions occurring during the execution of any instructions can
provides an efficient transfer of control to handlers and routines that process
error or generates an address error while in the exception processing state.
processing of one bus error another bus error occurs, the MC68030 has not
is not operational and halts. Only an external reset can restart a halted pro-
tion handler routine begins.
cessing includes all stacking operations, the fetch of the exception
vector, and filling of the instruction pipe caused by an exception. It
Exception processing refers specifically to the transition from normal
processing of a program to normal processing of system routines,
interrupt routines, and other exception handlers. Exception pro-
has completed when execution of the first instruction of the excep-
MC68030 USER'S MANUAL
N O T E
4-1
El