MPC8280 datasheet(419/1386 Pages) FREESCALE

tên linh kiện	MPC8280

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Clocks and Power Control

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

10-9

10.6

Clock Configuration Modes

The MPC8280 has three clocking modes: local, PCI host, and PCI agent. The clocking mode is set

according to three input pins—PCI_MODE, PCI_CFG[0], PCI_MODCK.

In each clocking mode, the configuration of bus, core, PCI, and CPM frequencies is determined by seven

bits during the power-on 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.

For further information and complete lists of each clock mode’s possible clock configurations, see

Section 7, “Clock Configuration Modes,” in the MPC8280 PowerQUICC II Family Hardware

Specifications (order number: MPC8280EC).

0x1C

0x03, 0x13

PLL off/bypassed

0x0F, 0x1F

PLL off

Table 10-4. 60x Bus-to-Core Frequency (continued)

SCMR[CORECNF]

Bus-to-Core Multiplier

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