668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 226

• Manufacturer Part Number: 668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0011

• 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: 316-1043

26.2.4 Interrupts
The System Mode Violation interrupt occurs whenever the IDET instruction is executed
while the System/User mode is enabled and the processor is in the User Mode. Its purpose
is to trap when system code is being executed while the processor is in the User Mode.
The System Mode Violation interrupt vector is in the IIR at offset 0x180. It always occurs
at Priority 3.
Note that Priority 3 is not available while the System/User Mode is enabled and the pro-
cessor is in the User Mode. If the processor is placed into Priority 3 either by an instruc-
tion or an interrupt, it will respond as if it was set to Priority 2.
When the System/User Mode is enabled, it is critical to handle the SU stack in interrupts
as well as the IP stack; always perform a SURES before the IPRES at the end of the
interrupt.
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Rabbit 3000 Microprocessor User’s Manual