MC68020FE33E Freescale Semiconductor, MC68020FE33E Datasheet - Page 274
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MC68020FE33E
Manufacturer Part Number
MC68020FE33E
Description
IC MICROPROCESSOR 32BIT 132CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68020EH16E.pdf
(306 pages)
Specifications of MC68020FE33E
Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68020FE33E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
MC68020FE33E1E30G
Manufacturer:
MOT
Quantity:
5 510
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Freescale Semiconductor, Inc.
9.8.2 Module Return
The RTM instruction is used to return from a module. For the type $00 module stack
frame, the processor reloads the condition codes, the PC, and the module data area
pointer register from the frame. The frame is removed from the top of the stack, the
argument count is added to the stack pointer, and execution returns to the calling module.
For the type $01 module stack frame, the processor reads the access level, condition
codes, PC, saved module data area pointer, and saved stack pointer from the module
stack frame. The access level is written to the DAL for validation by external hardware; the
processor then reads the access status to check the validation. If the external hardware
determines that the change in access right should not be granted, the access status is
zero, and the processor takes a format error exception. No visible processor registers are
changed, nor should the current access level enforced by external hardware be changed.
If the external hardware determines that the change in access rights should be granted,
the external hardware changes its access level, the values read from the module stack
frame are loaded into the corresponding processor registers, the argument count is added
to the new stack pointer value, and execution returns to the calling module.
If the called module does not wish the saved module data pointer to be loaded into a
register, the RTM instruction word can select register A7, and the loaded value will be
overwritten with the correct stack pointer value after the module stack frame is
deallocated.
9-20
M68020 USER’S MANUAL
MOTOROLA
For More Information On This Product,
Go to: www.freescale.com
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