MC68360EM25VL Freescale Semiconductor, MC68360EM25VL Datasheet - Page 177
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
MC68360EM25VL
Manufacturer Part Number
MC68360EM25VL
Description
IC MPU QUICC 25MHZ 240-FQFP
Manufacturer
Freescale Semiconductor
Datasheets
1.MC68EN360VR25L.pdf
(14 pages)
2.MC68EN360VR25L.pdf
(2 pages)
3.MC68360AI25L.pdf
(962 pages)
Specifications of MC68360EM25VL
Processor Type
M683xx 32-Bit
Speed
25MHz
Voltage
3.3V
Mounting Type
Surface Mount
Package / Case
240-FQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Features
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68360EM25VL
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
MC68360EM25VL
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
- Current page: 177 of 962
- Download datasheet (4Mb)
Freescale Semiconductor, Inc.
CPU32+
available at the supervisor level, but execution of some instructions is not permitted at the
user level. There are separate SPs for each level. The S-bit in the SR indicates privilege
level and determines which SP is used for stack operations. The processor identifies each
bus access (supervisor or user mode) via function codes to enforce supervisor and user
access levels.
In a typical system, most programs execute at the user level. User programs can access
only their own code and data areas and are restricted from accessing other information. The
operating system executes at the supervisor privilege level, has access to all resources, per-
forms the overhead tasks for the user level programs, and coordinates their activities.
5.4.2.1 SUPERVISOR PRIVILEGE LEVEL. If the S-bit in the SR is set, supervisor privilege
level applies, and all instructions are executable. The bus cycles generated for instructions
executed in supervisor level are normally classified as supervisor references, and the values
of the function codes on FC2–FC0 refer to supervisor address spaces.
All exception processing is performed at the supervisor level. All bus cycles generated dur-
ing exception processing are supervisor references, and all stack accesses use the SSP.
Instructions that have important system effects can only be executed at supervisor level. For
instance, user programs are not permitted to execute STOP, LPSTOP, or RESET instruc-
tions. To prevent a user program from gaining privileged access, except in a controlled man-
ner, instructions that can alter the S-bit in the SR are privileged. The TRAP #n instruction
provides controlled user access to operating system services.
5.4.2.2 USER PRIVILEGE LEVEL. If the S-bit in the SR is cleared, the processor executes
instructions at the user privilege level. The bus cycles for an instruction executed at the user
privilege level are classified as user references, and the values of the function codes on
FC2–FC0 specify user address spaces. While the processor is at the user level, implicit ref-
erences to the system SP and explicit references to address register seven (A7) refer to the
USP.
5.4.2.3 CHANGING PRIVILEGE LEVEL. To change from user privilege level to supervisor
privilege level, a condition that causes exception processing must occur. When exception
processing begins, the current values in the SR, including the S-bit, are saved on the super-
visor stack, and then the S-bit is set to enable supervisor access. Execution continues at
supervisor privilege level until exception processing is complete.
To return to user access level, a system routine must execute one of the following instruc-
tions: MOVE to SR, ANDI to SR, EORI to SR, ORI to SR, or RTE. These instructions execute
only at supervisor privilege level and can modify the S-bit of the SR. After these instructions
execute, the instruction pipeline is flushed, then refilled from the appropriate address space.
The RTE instruction causes a return to a program that was executing when an exception
occurred. When RTE is executed, the exception stack frame saved on the supervisor stack
can be restored in either of two ways.
MC68360 USER’S MANUAL
For More Information On This Product,
Go to: www.freescale.com
Related parts for MC68360EM25VL
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![MC68360](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![AN2036](/images/no-image3.png)
Part Number:
Description:
MC68360 MC68360 Multiple Ethernet Channels on the QUICC
Manufacturer:
Motorola / Freescale Semiconductor
![AN2035](/images/no-image3.png)
Part Number:
Description:
MC68360 Implementing an 8 bit Eprom for an MC68EC040-MC68360 System
Manufacturer:
Motorola / Freescale Semiconductor
![AN2038](/images/no-image3.png)
Part Number:
Description:
MC68360 Interfacing the MC68060 to the MC68360
Manufacturer:
Motorola / Freescale Semiconductor
![AN2040](/images/no-image3.png)
Part Number:
Description:
MC68360 MC68360 RAM Microcode Package Option Overview
Manufacturer:
Motorola / Freescale Semiconductor
![AN2045](/images/no-image3.png)
Part Number:
Description:
MC68360 MC68360 CPM-CPU Interaction
Manufacturer:
Motorola / Freescale Semiconductor
![AN2046](/images/no-image3.png)
Part Number:
Description:
MC68360 Interfacing SDRAM to the MC68360 QUICC Device
Manufacturer:
Motorola / Freescale Semiconductor
![AN2030](/images/no-image3.png)
Part Number:
Description:
MC68360 Interfacing the QUICC to a MCM516400 (4Mx4 10-12 column-row) DRAM
Manufacturer:
Motorola / Freescale Semiconductor
![AN2031](/images/no-image3.png)
Part Number:
Description:
MC68360 Interfacing the 68360 (QUICC) to T1-E1 Systems
Manufacturer:
Motorola / Freescale Semiconductor
![AN2032](/images/no-image3.png)
Part Number:
Description:
MC68360 Multiple QUICC Design Concept
Manufacturer:
Motorola / Freescale Semiconductor
![MC14560BCP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC12034AP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MPIC2112P](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC14520BCP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC12026AP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: