82C836 Datasheet, PDF (35/205 Pages) List of Unclassifed Manufacturers – Single-Chip 386sx AT

Functional Description
Operational Power Management s
Bits 3 and 2 in ICR 46H determine the normal or ‘‘run’’ mode frequency of PROCCLK,
selectable between CXIN, CXIN/2, CXIN/4 or CXIN8. The run mode is applicable
whenever:
• The sleep mode is disabled; or
• An interrupt (or NMI) has occurred
In the case of an interrupt, run mode continues until a subsequent HALT cycle. In the
case of a DMA, Refresh or Master operation, sleep mode resumes upon completion of
the operation. Reset also returns the system to run mode.
DMA, Refresh, and Master operations always occur with PROCCLK = CXIN, regardless
of run and sleep frequency settings.
Chips and Technologies, Inc.
PRELIMINARY
Revision 3.0 3-7