MC68EC040FE20A Freescale Semiconductor, MC68EC040FE20A Datasheet - Page 235
MC68EC040FE20A
Manufacturer Part Number
MC68EC040FE20A
Description
IC MPU 32BIT 20MHZ 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68EC040FE20A
Processor Type
M680x0 32-Bit
Speed
20MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68EC040FE20A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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8.4.3 Six-Word Stack Frame (Format $2)
If a six-word throwaway stack frame is on the active stack and an RTE instruction is
encountered, the processor restores the SR and PC values from the stack, increments the
active supervisor stack pointer by $C, and resumes normal instruction execution.
8-22
SP
+$02
+$06
+$08
Figure 8-6. Flowchart of RTE Instruction for Throwaway Four-Word Frame
15
0 0 1 0
SIX-WORD STACK FRAME–FORMAT $2
Stack Frames
PROGRAM COUNTER
STATUS REGISTER
ADDRESS
ERROR EXCEPTION
TAKE FORMAT
VECTOR OFFSET
Freescale Semiconductor, Inc.
For More Information On This Product,
INVALID FORMAT
WORD
M68040 USER’S MANUAL
Go to: www.freescale.com
0
READ FORMAT WORD
TEMP
OTHER FORMATS
• CHK, CHK2, TRAPcc,
• Unimplemented Floating -
• Address Error
OTHERWISE
OTHERWISE
OTHERWISE
ENTRY
FTRAPcc, TRAPV, Trace,
or Zero Divide
Point Instruction
Exception Types
(SP)+
FORMAT CODE = $0
FORMAT CODE = $1
(4-WORD FRAME)
(THROWAWAY
FRAME)
SP
PC
SR
SR
SP
EXIT
• Next Instruction: address is
• Next Instruction: address is
• Instruction that caused the
(SP) +
TEMP
TEMP
SP + 6
SP + 6
the address of the
instruction that caused the
exception.
the calculated <ea> for the
floating-point instruction.
address error, address is
the reference address – 1.
Stacked PC Points To
MOTOROLA
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