Rabbit 6000 User’s Manual
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407
36.2.4 Short Chip Selects
When running at a reduced clock speed, it is likely that the chip selects for external devices will
not need to be active for an entire clock cycle. By reducing the width of the chip select, the power
consumption of the memory chip can be reduced without having any affect on the processor itself.
For reduced processor speeds based on the main oscillator, a short chip select can be enabled in
GPSCR (this feature is not available when the processor is running at full speed). This feature can
be enabled separately for both reads and writes. When enabled, the chip select signals will be the
width of two undivided clocks and located at the end of the transaction. The read data in the fig-
ures below is sampled by the rising edge of CLKI that terminated the T2 cycle. Wait states are
inserted between T1 and T2 so they do not affect the width of the strobe.
Summary of Contents for 6000
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