NXP Semiconductors
DRAFT | D | D |
| AFT |
RAFT | RAFT AFT | |||
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| DR | DR |
DLPC2917/19
ARM9 microcontrollerRAFT withDRAFTCANDRAFTand LINDRAFT
T DRAFT |
| T |
DRA | DRA DR | |
F | F | |
| DRAF | |
DRAFT DRAFT |
Clock Source Bus |
| DRAFT DRAFT | ||
LP_OSC |
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| DRAFT | D |
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Xtal | FDIV0 | OUT 0 | DRA | |
PLL | ||||
Oscilator |
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| FDIV1 | OUT 1 |
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| FDIV6 | OUT 9 |
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Frequency | Clock |
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Monitor | Detection |
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| DTL MMIO Interface |
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Fig 12. Block diagram of the CGU
There are two primary clock generators: a
LP_OSC is the source for the BASE_PCR_CLK that clocks the CGU itself and for BASE_SAFE_CLK that clocks a minimum of other logic in the device (like the watchdog timer). To prevent the device from losing its clock source LP_OSC cannot be put into
Secondary clock generators are a PLL and seven fractional dividers (FDIV0..6). The PLL has three clock outputs: normal, 120°
Configuration of the CGU: For every output generator - generating the base clocks - a choice can be made from the primary and secondary clock generators according to Figure 13.
LPC2917_19_1 | © NXP B.V. 2007. All rights reserved. |
Preliminary data sheet | Rev. 1.01 — 15 November 2007 | 43 of 68 |