668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 73

• 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

7.4.1 Example ISR
A sample interrupt handler is shown below.
7.4.2 Expand Interrupts for Additional Peripheral Devices
When you need to expand the number of interrupts for additional peripheral devices, use
the interrupt routine to dispatch interrupts to other virtual interrupt routines. Each additional
interrupting device will have to signal the processor that it is requesting an interrupt. A
separate signal line is needed for each device so that the processor can determine which
devices are requesting an interrupt.
The following code shows how the interrupt service routines can be written.
Chapter 7 External Interrupts
extInt_isr::
; respond to external interrupt here
; interrupt is automatically cleared by interrupt acknowledge
ipres
ret
; External interrupt Routine #0 (programmed priority could be 3)
int2:
; insert body of interrupt routine here
;
PUSH IP
IPSET 1
POP IP
IPRES
RET
; save interrupt priority
; set to priority really desired (1, 2, etc.)
; get back entry priority
; restore interrupted routine’s priority
; return from interrupt
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