Rabbit Rabbit 4000, User Manual

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Chapter 26 Low-Power Operation 281
Global Power Save Control Register (GPSCR) (Address = 0x000D)
Bit(s) Value Description
7:5 000 Self-timed chip selects are disabled.
001 230 ns self-timed chip selects for read and write.
010 170 ns self-timed chip selects for read and write.
011 110 ns self-timed chip selects for read and write.
100 290 ns self-timed chip selects for read only.
101 230 ns self-timed chip selects for read only.
110 170 ns self-timed chip selects for read only.
111 110 ns self-timed chip selects for read only.
4 0 Normal chip select timing for read cycles.
1 Short chip select timing for read cycles (not available in full speed).
3 0 Normal chip select timing for write cycles
1 Short chip select timing for write cycles (not available in full speed).
2:0 000 The 32 kHz clock divider is disabled.
001 This bit combination is reserved and should not be used.
010 This bit combination is reserved and should not be used.
011 This bit combination is reserved and should not be used.
100 32 kHz clock divided by 2 (16.384 kHz).
101 32 kHz clock divided by 4 (8.192 kHz).
110 32 kHz clock divided by 8 (4.096 kHz).
111 32 kHz clock divided by 16 (2.048 kHz).