MPC8280VRM datasheet(27/80 Pages) FREESCALE

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MPC8280 PowerQUICC II™ Family Hardware Specifications, Rev. 1.7

Freescale Semiconductor

Clock Configuration Modes

0111_001

Reserved

0111_010

Reserved

0111_011

50.0

133.3

150.0

400.0

150.0

400.0

0111_100

42.9

133.3

128.6

400.0

3.5

150.0

466.7

0111_101

37.5

133.3

112.5

400.0

150.0

533.3

0111_110

33.3

133.3

100.0

400.0

4.5

150.0

600.0

0111_111

Reserved

1000_000

Reserved

1000_001

Reserved

1000_010

42.9

114.3

3.5

150.0

400.0

3.5

150.0

400.0

1000_011

37.5

114.3

3.5

131.3

400.0

150.0

457.1

1000_100

33.3

114.3

3.5

116.7

400.0

4.5

150.0

514.3

1000_101

30.0

114.3

3.5

105.0

400.0

150.0

571.4

1000_110

28.6

114.3

3.5

100.0

400.0

5.5

150.0

628.6

1100_000

Reserved

1100_001

Reserved

1100_010

Reserved

1101_000

Reserved

The “low” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency in a

table entry guarantees only the required minimum CPU operating frequency. The “high” values are for the purpose

of illustration only. Users must select a mode and input bus frequency so that the resulting configuration does not

violate the frequency rating of the user’s device. The minimum CPM frequency is 120 MHz. Minimum CPU frequency

is determined by the clock mode. For modes with a CPU multiplication factor <= 3, the minimum CPU frequency is

150 MHz for commercial temperature devices and 175 MHz for extended temperature devices. For modes with a CPU

multiplication factor >= 3.5: for Rev0.1 the minimum CPU frequency is 250 MHz; for RevA or later the minimum CPU

frequency is 150 MHz for commercial temperature devices and 175 MHz for extended temperature devices.

MODCK_H = hard reset configuration word [28–31]. MODCK[1-3] = three hardware configuration pins.

60x and local bus frequency. Identical to CLKIN.

CPM multiplication factor = CPM clock/bus clock

CPU multiplication factor = Core PLL multiplication factor

Table 16. Clock Configurations for Local Bus Mode 1 (continued)

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

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