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MOTOROLA
M68040 USER鈥橲 MANUAL
A-7
MC68LC040 REV2.3 (01/29/2000)
When the MC68LC040 writes or reads a stack frame, it uses long-word operand transfers
wherever possible. Using a long-word-aligned stack pointer greatly enhances exception pro-
cessing performance. The processor does not necessarily read or write the stack frame data
in sequential order. The system software should not depend on a particular exception gen-
erating a particular stack frame. For compatibility with future devices, the software should be
able to handle any format of stack frame for any type of exception. The MC68LC040 does
not generate the oating-point post-instruction stack frame. The MC68040 cannot accept the
eight-word unimplemented stack frame. The MC68LC040 can handle all MC68040 stack
frame formats.
A.6 MC68LC040 ELECTRICAL CHARACTERISTICS
The following paragraphs provide information on the maximum rating and thermal charac-
teristics for the MC68LC040. This section is subject to change. For the most recent speci-
cations, contact a Motorola sales ofce or complete the registration card at the end of this
manual.
A.6.1 Maximum Ratings
A.6.2 Thermal Characteristics
The MC68040 cannot
generate or read this stack.
Effective address field is
the address of the faulted
instruction operand.
Characteristic
Symbol
Value
Unit
This device contains protective
circuitry against damage due to
high static voltages or electrical
fields; however, it is advised that
normal precautions be taken to
avoid application of any voltages
higher
than
maximum-rated
voltages to this high-impedance
circuit. Reliablity of operation is
enhanced if unused inputs are
tied
to
an
appropriate
logic
voltage level (e.g., either GND or
VCC).
Supply Voltage
VCC
鈥�0.3 to +7.0
V
Input Voltage
Vin
鈥�0.5 to +7.0
V
Maximum Operating Junction Temperature
TJ
110
掳C
Minimum Operating Ambient Temperature
TA
0
掳C
Storage Temperature Range
Tstg
鈥�55 to 150
掳C
Characteristic
Symbol
Value
Rating
Thermal Resistance, Junction to Case鈥�
PGA Package
JC
3
掳C/W
Table 12-1. Eight-Word Stack Frame (Format $4)
15
0
SP
+$02
+$06
+$08
+$0C
STATUS REGISTER
PROGRAM COUNTER
0100
VECTOR OFFSET
EFFECTIVE ADDRESS
PC OF FAULTED
INSTRUCTION
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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