19
Global Clock Modulator 0 Register
(GCM0R)
(Address = 0x000A)
Bit(s)
Value
Description
7
0
Enable normal spectrum spreading.
1
Enable strong spectrum spreading.
6:0
These bits are reserved and should be written with zeros.
Global Clock Modulator 1 Register
(GCM1R)
(Address = 0x000B)
Bit(s)
Value
Description
7
0
Disable the spectrum spreader.
1
Enable the spectrum spreader.
6:0
These bits are reserved and should be written with zeros.
Global Power Save Control Register
(GPSCR)
(Address = 0x000D)
Bit(s)
Value
Description
7:5
000
Self-timed chip selects are disabled.
001
This bit combination is reserved and should not be used.
011
This bit combination is reserved and should not be used.
100
296 ns self-timed chip selects (192 ns best case, 457 ns worst case).
101
234 ns self-timed chip selects (151 ns best case, 360 ns worst case).
110
171 ns self-timed chip selects (111 ns best case, 264 ns worst case).
111
109 ns self-timed chip selects (71 ns best case, 168 ns worst case).
4
0
Normal Chip Select operation.
1
Short Chip Select timing when dividing main oscillator by 4, 6, or 8.
3*
(Rabbit
3000A)
*
Bit 3 was always written with zero in the original Rabbit 3000 chip.
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.
011
This bit combination is reserved and should not be used.
100
32 kHz oscillator divided by two (16.384 kHz).
101
32 kHz oscillator divided by four (8.192 kHz).
110
32 kHz oscillator divided by eight (4.096 kHz).
111
32 kHz oscillator divided by sixteen (2.048 kHz).