MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 187

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4.3.7 Compressed Address Format – Indirect Branches
4.3.8 Compression Process
MPC555
USER’S MANUAL
An instruction in memory which will serve as the target of a branch will have a label
attached. The label provides the needed pointer to the other half of the branch target
instruction. The label token will be skipped in normal sequential operation. The label
has three parts. First, the label prefix character (which is skipped by the decompres-
sor). Second, a 5-bit pointer to the second half of the instruction. Third, a bit which in-
dicates the location of the second instruction half on the same line or the next line.
Indirect branches use the regular two pointer format described above. The indirect
branch destination address is copied without any change from one of the following reg-
isters:
See the PowerPC™
The compression process is implemented by the following steps (See
The compiler will add a few simple “hooks” to the compiled code which will make com-
pression possible. Compiled code will be generated in the “elf” format for code
Figure 4-10 Extracting Direct Branch Target Address in the Decompressor
Address
Base
• LR
• CTR
• SRR0
• User code compilation/linking
• User application code compression by software compression tool.
/
MPC556
Left Stream
0
RCPU User’s Manual,
Label token
Instruction Code
Rev. 15 October 2000
11 12
BURST BUFFER
Label Format
1819
RCPURM/AD, for more details.
Right Stream
Boundary Bit Field
Same / Next Line bit
Prefix Character
5-bit Pointer
30 31
0
1
1
0
0
1
0
1
1
0
1
Figure
MOTOROLA
4-11):
4-11