When operating from the 32 kHz oscillator, the same options are available, but the timing is somewhat different. This is illustrated in the diagrams below for the four different cases. In these case the chip selects are one clock cycle (of the 32 kHz clock) long.

 

T1

T2

32KkHz

 

 

clock

 

 

ADDR

Valid

 

DATA

 

 

/CSxMEMCSxB

 

 

/OMExMOExB

 

 

2 kHz operation

Figure B-7. Short Chip Select Timing: 2 kHz, Read Operation

 

T1

T2

32 kHz

 

 

clock

 

 

ADDR

Valid

 

DATA

 

 

/CSx

 

 

/OEx

 

 

4 kHz operation

Figure B-8. Short Chip Select Timing: 4 kHz, Read Operation

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Rabbit 3000 Microprocessor

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Jameco Electronics 2000, 3000 manual Figure B-7. Short Chip Select Timing 2 kHz, Read Operation