20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 302

• Manufacturer Part Number: 20-668-0024
• Description: IC CPU RABBIT4000 128-LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0024

• Processor Type: Rabbit 4000 8-bit
• Speed: 60MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 20-668-0022; 316-1078

27.3.7 Handling Interrupts in the System/User Mode
Interrupts,
s,
, and
all enter the System Mode automatically. There
RST
SYSCALL
SCALL
will be times, however, that an interrupt should be handled in the User Mode. The solution
to this is for System Mode interrupt vector to reenter the User Mode before calling the
User Mode interrupt handler. An example of both system and user interrupt handling is
shown in Figure 27-4.
When enabled for User Mode access, a peripheral interrupt (if it is capable of generating
an interrupt) can only be requested at Priority 2 or 1.
Figure 27-4. Interrupt Handing in the System/User Mode
292
Rabbit 4000 Microprocessor User’s Manual