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Rabbit 6000 User’s Manual
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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
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