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MPC8280 Datasheet(PDF) 419 Page - Freescale Semiconductor, Inc

Part # MPC8280
Description  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 419 Page - Freescale Semiconductor, Inc

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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
8x
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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