MC68040FE25V Freescale Semiconductor, MC68040FE25V Datasheet - Page 235

• Manufacturer Part Number: MC68040FE25V
• Description: IC MICROPROCESSOR 32BIT 184-CQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68040FE25V

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 184-CQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

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