参数资料
型号: MPC8280CZUUPE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 100 MHz, RISC PROCESSOR, PBGA480
封装: 37 X 37 MM, 1.27 MM PITCH, FTBGA-480
文件页数: 74/156页
文件大小: 1680K
代理商: MPC8280CZUUPE
24
MPC8280 PowerQUICC II Family Hardware Specications
MOTOROLA
Clock Conguration Modes
In each clocking mode, the conguration of bus, core, PCI, and CPM frequencies is determined by seven
bits during the power-up reset—three hardware conguration pins (MODCK[1–3]) and four bits from
hardware conguration 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 15 lists clock congurations 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
conguration does not exceed the frequency rating of the user’s device.
NOTE
Clock congurations change only after PORESET is asserted.
Table 15. Clock Congurations for Local Bus Mode1
Mode2
Bus Clock3
(MHz)
CPM
Multiplication
Factor4
CPM Clock
(MHz)
CPU
Multiplication
Factor5
CPU Clock
(MHz)
MODCK_H-MODCK[1-3]
low
high
low
high
low
high
Default Modes (MODCK_H= 0000)
0000_000
62.5
133.3
3
187.5
400.0
4
250.0
533.3
0000_001
50.0
133.3
3
150.0
400.0
5
250.0
666.7
0000_010
62.5
100.0
4
250.0
400.0
4
250.0
400.0
0000_011
50.0
100.0
4
200.0
400.0
5
250.0
500.0
0000_100
66.7
167.0
2
133.3
334.0
2.5
166.7
417.5
0000_101
66.7
167.0
2
133.3
334.0
3
200.0
501.0
0000_110
66.7
160.0
2.5
166.7
400.0
2.5
166.7
400.0
0000_111
55.5
160.0
2.5
138.7
400.0
3
166.7
480.0
Full Conguration Modes
0001_000
66.7
167.0
2
133.3
334.0
4
266.7
668.0
0001_001
66.7
167.0
2
133.3
334.0
5
333.3
835.0
0001_010
66.7
167.0
2
133.3
334.0
6
396.0
1002.0
0001_011
Reserved
0001_100
Reserved
0001_101
62.5
133.3
3
187.5
400.0
4
250.0
533.3
0001_110
50.0
133.3
3
150.0
400.0
5
250.0
666.7
1000_111
45.5
133.3
3
136.4
400.0
5.5
250.0
733.3
0001_111
44.3
133.3
3
133.3
400.0
6
266.7
800.0
0010_000
Reserved
0010_001
Reserved
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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