![background image](http://html2.mh-extra.com/html/rabbit/6000/6000_user-manual_3115352218.webp)
Rabbit 6000 User’s Manual
digi.com
218
21.2 Dependencies
21.2.1 I/O Pins
When the slave port is enabled by writing to SPCR, the following pins are enabled for slave port mode.
Note that enabling the slave port mode will override any general-purpose I/O or external I/O bus settings
for these pins; when the slave port is enabled they will perform slave port functionality.
21.2.2 Clocks
All slave port operations are based on the processor clock.
21.2.3 Interrupts
If slave port interrupts are enabled, a slave port interrupt will occur on the slave device whenever the mas-
ter writes to SPD0R. The /SLVATTN pin is asserted whenever the slave device writes to SPD0R. Either of
these conditions is cleared when either the master or slave reads or writes any of the slave port registers.
The slave port interrupt vector is in the IIR at offset 0x080. It can be set as Priority 1, 2, or 3 by writing to
SPCR.
Table 21-2. Slave Port Pin Functionality
Pin(s)
Slave Port
Signal
Direction
Functionality
PA0–PA7
SD0–SD7
Bidirectional Slave data bus
PB7
/SLVATTN
Output
Slave interrupt request (output)
PB6
/SCS
Input
Slave chip select
PB4–PB5
SA0–SA1
Input
Slave address bus
PB3
/SRD
Input
Slave port read strobe
PB2
/SWR
Input
Slave port write strobe
PE7
/SCS
Input
Alternate slave chip select
Summary of Contents for 6000
Page 1: ...Rabbit 6000 Microprocessor User s Manual 90001108_J...
Page 11: ...Rabbit 6000 User s Manual digi com 11 1 3 Block Diagram Figure 1 1 Rabbit 6000 Block Diagram...
Page 43: ...Rabbit 6000 User s Manual digi com 43 4 1 1 Block Diagram...
Page 57: ...Rabbit 6000 User s Manual digi com 57 5 1 1 Block Diagram...
Page 88: ...Rabbit 6000 User s Manual digi com 88 7 2 Block Diagram...
Page 115: ...Rabbit 6000 User s Manual digi com 115 11 1 1 Block Diagram...
Page 127: ...Rabbit 6000 User s Manual digi com 127 12 1 1 Block Diagram...
Page 138: ...Rabbit 6000 User s Manual digi com 138 13 1 1 Block Diagram...
Page 154: ...Rabbit 6000 User s Manual digi com 154 15 1 1 Block Diagram...
Page 163: ...Rabbit 6000 User s Manual digi com 163 16 1 1 Block Diagram...
Page 170: ...Rabbit 6000 User s Manual digi com 170 17 1 1 Block Diagram...
Page 177: ...Rabbit 6000 User s Manual digi com 177 18 1 1 Block Diagram...
Page 186: ...Rabbit 6000 User s Manual digi com 186 19 1 1 Block Diagram...
Page 230: ...Rabbit 6000 User s Manual digi com 230 22 2 Block Diagram...
Page 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
Page 287: ...Rabbit 6000 User s Manual digi com 287 25 1 1 Block Diagram...
Page 310: ...Rabbit 6000 User s Manual digi com 310 26 1 1 Block Diagram...
Page 323: ...Rabbit 6000 User s Manual digi com 323 28 1 1 Block Diagram...
Page 351: ...Rabbit 6000 User s Manual digi com 351 31 1 4 Block Diagram...
Page 361: ...Rabbit 6000 User s Manual digi com 361 32 1 1 Block Diagram...
Page 369: ...Rabbit 6000 User s Manual digi com 369 33 2 Block Diagram...
Page 390: ...Rabbit 6000 User s Manual digi com 390 35 1 1 Block Diagram...
Page 408: ...Rabbit 6000 User s Manual digi com 408...
Page 410: ...Rabbit 6000 User s Manual digi com 410...
Page 411: ...Rabbit 6000 User s Manual digi com 411...
Page 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...