MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 235

• Manufacturer Part Number: MC68EC040RC25
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC040RC25

• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 25MHz
• Instruction Set Architecture: RISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 179
• Package Type: PGA
• Lead Free Status / Rohs Status: Supplier Unconfirmed

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