參數(shù)資料
型號: MPC564MZP56
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 56 MHz, RISC MICROCONTROLLER, PBGA388
封裝: 27 X 27 MM, 1 MM PITCH, PLASTIC, MO-151, BGA-388
文件頁數(shù): 569/1496頁
文件大?。?/td> 20425K
代理商: MPC564MZP56
MOTOROLA
Chapter 3. Central Processing Unit
3-21
VEA Register Set — Time Base (TB)
3.7.7
Count Register (CTR)
The count register (CTR), SPR 9, is used to hold a loop count that can be decremented
during execution of branch instructions with an appropriately coded BO field. If the value
in CTR is 0 before being decremented, it is –1 afterward. The count register provides the
branch target address for the branch conditional to count register (bcctrx) instructio
3.8
VEA Register Set — Time Base (TB)
The virtual environment architecture (VEA) defines registers in addition to the UISA
register set. The VEA register set can be accessed by all software with either user- or
supervisor-level privileges. Refer to Section 6.1.7, “Time Base (TB),” for more
information.
3.9
OEA Register Set
The operating environment architecture (OEA) includes a number of SPRs and other
registers that are accessible only by supervisor-level instructions. Some SPRs are
RCPU-specific; some RCPU SPRs may not be implemented in other PowerPC ISA
processors, or may not be implemented in the same way.
3.9.1
Machine State Register (MSR)
The machine state register is a 32-bit register that defines the state of the processor. When
an exception occurs, the contents of the MSR are loaded into SRR1, and the MSR is
updated to reflect the exception-processing machine state. The MSR can also be modified
by the mtmsr, sc, and rfi instructions. It can be read by the mfmsr instruction.
MSB
0
1
2
3
456789
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
LSB
31
Field
Branch Address
Reset
Unchanged
Addr
SPR 8
Figure 3-9. Link Register (LR)
MSB
0
1
23456789
10
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
LSB
31
Field
Loop Count
Reset
Unchanged
Addr
SPR 9
Figure 3-10. Count Register (CTR)
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MPC565 制造商:未知廠家 制造商全稱:未知廠家 功能描述:NEXUS Debugger and Trace for PowerPC
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