MC68LC040RC25A Datasheet, PDF (367/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
MC68LC040 REV2.3 (01/29/2000)
Table 12-1. Eight-Word Stack Frame (Format $4)
15
SP
STATUS REGISTER
+$02
+$06
+$08
PROGRAM COUNTER
0100
VECTOR OFFSET
EFFECTIVE ADDRESS
+$0C
PC OF FAULTED
INSTRUCTION
• The MC68040 cannot
generate or read this stack.
0
• Effective address field is
the address of the faulted
instruction operand.
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 floating-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 specifi-
cations, contact a Motorola sales office or complete the registration card at the end of this
manual.
A.6.1 Maximum Ratings
Characteristic
Supply Voltage
Input Voltage
Maximum Operating Junction Temperature
Minimum Operating Ambient Temperature
Storage Temperature Range
Symbol
V_CC
V_in
T_J
T_A
T_stg
Value
–0.3 to +7.0
–0.5 to +7.0
110
0
–55 to 150
Unit This device contains protective
circuitry against damage due to
V high static voltages or electrical
fields; however, it is advised that
V
normal precautions be taken to
avoid application of any voltages
°C
higher than maximum-rated
voltages to this high-impedance
circuit. Reliablity of operation is
°C enhanced if unused inputs are
tied to an appropriate logic
°C
voltage level (e.g., either GND or
V_CC).
A.6.2 Thermal Characteristics
Characteristic
Thermal Resistance, Junction to Case—
PGA Package
Symbol
θ_JC
Value
3
Rating
°C/W
MOTOROLA
M68040 USER’S MANUAL
A-7
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