MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 158

• 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

3.12 Instruction Timing
MPC555
USER’S MANUAL
The MPC555 / MPC556 processor is pipelined. Because the processing of an instruc-
tion is broken into a series of stages, an instruction does not require the entire resourc-
es of the processor.
The instruction pipeline in the MPC555 / MPC556 has four stages:
1. The dispatch stage is implemented using a distributed mechanism. The central
/
MPC556
dispatch unit broadcasts the instruction to all units. In addition, scoreboard in-
formation (regarding data dependencies) is broadcast to each execution unit.
Each execution unit decodes the instruction. If the instruction is not implement-
ed, a program exception is taken. If the instruction is legal and no data depen-
dency is found, the instruction is accepted by the appropriate execution unit,
and the data found in the destination register is copied to the history buffer. If a
data dependency exists, the machine is stalled until the dependency is re-
solved.
(Hexadecimal)
01500–01BFF
Vector Offset
00C00
00D00
01C00
01D00
00A00
00B00
00E00
01E00
01F00
00000
00100
00200
00300
00400
00500
00600
00700
00800
00900
01000
01100
01200
01300
01400
Table 3-21 Exception Vector Offset Table
Implementation-dependent non-maskable external breakpoint
Implementation-dependent maskable external breakpoint
CENTRAL PROCESSING UNIT
Implementation-dependent instruction protection error
implementation-dependent instruction breakpoint
Implementation-dependent data protection error
Implementation-dependent software emulation
Rev. 15 October 2000
Implementation-dependent data breakpoint
System reset, NMI interrupt
Floating-point unavailable
Floating-point assist
External interrupt
Exception Type
Machine check
Decrementer
System call
Alignment
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Program
Trace
MOTOROLA
3-36