Rabbit 2000 - 13.2 Slave Port Registers

User’s Manual 139
The registers appear to be internal I/O registers to the slave. To the master, at least for a
Rabbit master, the registers appear to be external I/O registers. The figure below shows the
sequence of events when the master reads/writes the slave port registers.
Figure 13-2. Slave Port R/W Sequencing
/SCS
SD[7:0]
/SRD
Slave Port Read Cycle
Slave Port Write Cycle
/SWR
SA1, SA0
Tsu(SCS)
Tsu(SA)
Th(SA)
Th(SCS)
Tw(SRD)
Ten(SRD)
Tdis(SRD)
Ta(SRD)
Tsu(SWR  SRD)
/SCS
SD[7:0]
/SRD
/SWR
SA1, SA0
Tsu(SCS)
Tsu(SA)
Th(SA)
Th(SCS)
Tw(SWR)
Th(SD)
Tsu(SD)
Tsu(SRD  SWR)