20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 173
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 20-668-0011
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
Data Bus Width
8 bit
Maximum Clock Frequency
55.5 MHz
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 55 C
Number Of Programmable I/os
56
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
316-1061
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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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