MC68040FE33A Freescale Semiconductor, MC68040FE33A Datasheet - Page 230

IC MICROPROCESSOR 32BIT 184-CQFP

MC68040FE33A

Manufacturer Part Number
MC68040FE33A
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68040FE33A

Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Package
184CQFP
Processor Series
M680xx
Core
CPU32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
 Details

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68040FE33A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Freescale Semiconductor, Inc.
8.2.10 Reset Exception
Asserting the reset in (RSTI) input signal causes a reset exception. The reset exception
has the highest priority of any exception; it provides for system initialization and recovery
from catastrophic failure. Reset also aborts any processing in progress when RSTI is
recognized; processing cannot be recovered. Figure 8-5 is a flowchart of the reset
exception processing.
The reset exception places the processor in the interrupt mode of the supervisor privilege
mode by setting the S-bit and clearing the M-bit and disables tracing by clearing the T1
and T0 bits in the SR. This exception also sets the processor’s interrupt priority mask in
the SR to the highest level, level 7. Next the VBR is initialized to zero ($00000000), and
the enable bits in the cache control register (CACR) for the on-chip caches are cleared.
The reset exception also clears the enable bit but does not affect page size in the
translation control registers. It clears the enable bit in each of the four transparent
translation registers. An interrupt acknowledge bus cycle is begun to generate a vector
number. This vector number references the reset exception vector (two long words, vector
numbers 0 and 1) at offset zero in the supervisor address space. The first long word is
loaded into the interrupt stack pointer, and the second long word is loaded into the PC.
Reset exception processing concludes with the prefetch of the first four long words
beginning at the memory location pointed to by the PC.
MOTOROLA
M68040 USER’S MANUAL
8- 17
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