MOTOROLA
M68040 USER’S MANUAL
xv
TABLE OF CONTENTS (Continued)
Paragraph
Page
Number
Title
Number
B.4
Special Modes Of Operation .................................................................B-8
B.5
Exception Processing............................................................................ B-10
B.5.1
Unimplemented Floating-Point Instructions and Exceptions ............. B-10
B.5.2
MC68EC040 Stack Frames ...............................................................B-11
B.6
Software Considerations .......................................................................B-12
B.7
MC68EC040 Electrical Characteristics ................................................. B-12
B.7.1
Maximum Ratings ..............................................................................B-12
B.7.2
Thermal Characteristics .....................................................................B-12
B.7.3
DC Electrical Specifications ...............................................................B-13
B.7.4
Power Dissipation ..............................................................................B-13
B.7.5
Clock AC Timing Specifications .........................................................B-14
B.7.6
Output AC Timing Specifications ....................................................... B-15
B.7.7
Input AC Timing Specifications..........................................................B-16
Appendix C
MC68040V and MC68EC040V
C.1
Additional Signals.................................................................................. C-1
C.1.1
Low Frequency Operation (LFO) .......................................................C-2
C.1.2
Loss of Clock (LOC) .......................................................................... C-2
C.1.3
System Clock Disable (SCD)............................................................. C-2
C.2
Low-Power Stop Mode ..........................................................................C-3
C.2.1
Bus Arbitration and Snooping ............................................................C-5
C.2.2
Low Frequency Operation ................................................................. C-5
C.2.3
Changing BCLK Frequency ...............................................................C-5
C.2.4
LPSTOP Instruction Summary ..........................................................C-6
C.3
Clocking During Normal Operation .......................................................C-7
C.4
Reset Operation ....................................................................................C-7
C.5
Power Cycling .......................................................................................C-9
C.6
MC68040V and MC68EC040V JTAG (Preliminary) .............................. C-10
C.6.1
Instruction Shift Register ...................................................................C-11
C.6.1.1
EXTEST .........................................................................................C-12
C.6.1.2
HIGHZ ............................................................................................C-12
C.6.1.3
SAMPLE/PRELOAD ...................................................................... C-12
C.6.1.4
CLAMP........................................................................................... C-12
C.6.1.5
BYPASS......................................................................................... C-13
C.6.2
Boundary Scan Register.................................................................... C-13
C.6.3
Restrictions ........................................................................................C-16
C.6.4
Disabling The IEEE Standard 1149.1A Operation............................. C-16
C.6.5
MC68040V and MC68EC040V JTAG Electrical Characteristics ....... C-17
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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