668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 173
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1016
- Current page: 173 of 312
- Download datasheet (2Mb)
19.3.7 Other Configurations
There are other slave port configurations possible:
• The master could use the external I/O bus instead of the memory bus.
• All devices could poll the slave port status register to determine when data is present
• The master could write to SPD0R, triggering an interrupt on the slave. The slave could
If polling is to be used, it is important to note that not all bits in the status register may be
updated at once; it is possible to read a transitional value as the register updates. To guar-
antee a proper polling read, the status register should be read twice; when the same value
is read both times the value is correct.
Similarly, it is possible to receive a scrambled value from a data register if it is read while
being written. The protocol used should take account of this and prevent it from occurring
(the protocol described above guarantees this will not occur).
Chapter 19 Slave Port
instead of relying on interrupts.
then simply write a response into SPD0R, which the master detects by polling SPSR.
This configuration is useful when fewer signals are desired, or the master device has no
external interrupts available.
163
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