參數(shù)資料
型號： MPC8280CVVUPEX
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 450 MHz, RISC PROCESSOR, PBGA480
封裝： 37.50 X 37.50 MM, 1.55 MM HEIGHT, 1.27 MM PITCH, LEAD FREE, TBGA-480
文件頁數(shù)： 17/80頁
文件大?。?/td> 536K
代理商： MPC8280CVVUPEX
MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 1.8
24
Freescale Semiconductor
Clock Configuration Modes
In each clocking mode, the configuration of bus, core, PCI, and CPM frequencies is determined by seven bits during
the power-up reset—three hardware configuration pins (MODCK[1–3]) and four bits from hardware configuration
word[28–31] (MODCK_H). Both the PLLs and the dividers are set according to the selected MPC8280 clock
operation mode as described in the following sections.
7.1 Local Bus Mode
Table 16 lists clock configurations for the MPC8280 in local bus mode. The frequencies listed are for the purpose
of illustration only. Users must select a mode and input bus frequency so that the resulting configuration does not
exceed the frequency rating of the user’s device.
NOTE
Clock configurations change only after PORESET is asserted.
Table 16. Clock Configurations for Local Bus Mode 1
Mode 2
Bus Clock 3
(MHz)
CPM
Multiplication
Factor 4
CPM Clock
(MHz)
CPU
Multiplication
Factor 5
CPU Clock
(MHz)
MODCK_H-MODCK[1:3]
Low
High
Low
High
Low
High
Default Modes (MODCK_H= 0000)
0000_000
37.5
133.3
3
112.5
400.0
4
150.0
533.3
0000_001
33.3
133.3
3
100.0
400.0
5
166.7
666.7
0000_010
37.5
100.0
4
150.0
400.0
4
150.0
400.0
0000_011
30.0
100.0
4
120.0
400.0
5
150.0
500.0
0000_100
60.0
167.0
2
120.0
334.0
2.5
150.0
417.5
0000_101
50.0
167.0
2
100.0
334.0
3
150.0
501.0
0000_110
60.0
160.0
2.5
150.0
400.0
2.5
150.0
400.0
0000_111
50.0
160.0
2.5
125.0
400.0
3
150.0
480.0
Full Configuration Modes
0001_000
50.0
167.0
2
100.0
334.0
4
200.0
668.0
0001_001
50.0
167.0
2
100.0
334.0
5
250.0
835.0
0001_010
50.0
145.8
2
100.0
291.7
6
300.0
875.0
0001_011
Reserved
0001_100
Reserved
0001_101
37.5
133.3
3
112.5
400.0
4
150.0
533.3
0001_110
33.3
133.3
3
100.0
400.0
5
166.7
666.7
1000_111
33.3
133.3
3
100.0
400.0
5.5
183.3
733.3
0001_111
33.3
133.3
3
100.0
400.0
6
200.0
800.0
0010_000
Reserved
0010_001
Reserved
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