pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 211

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

Revision 1.2
4.0 Embedded Controller Modules
4.17.5 Usage Hints
The hints below apply when Idle mode is used with a disabled HFCG.
1. When disabling HFCG in Idle mode, on wake-up, a frequency clock may be generated that differs from the selected set-
2. After waking up from Idle mode, wait 0.5 seconds before returning to the optimal SZCFG0 configuration.
ting due to temperature variations in the working environment during the idle period. For details on the resulting deviation
from the nominal frequency, refer to “tCLKINTwk” on page 346. To avoid any failures that may result from waking up to
a higher frequency in case the access time to the internal or external memory is marginal using the current BIU config-
uration, follow the procedures exactly.
Before entering Idle mode, configure SZCFGi (where i=0-2) for an additional Wait clock cycle (see Section 4.1.10 on
page 81 for details on SZCFGi configuration).
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