20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 79

• 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

7. E
I
XTERNAL
NTERRUPTS
7.1 Overview
The Rabbit 4000 has six external interrupts available, and they share two interrupt vectors.
In the case of multiple interrupts sharing an interrupt vector, the data register correspond-
ing to the parallel port(s) being used can be read. Each interrupt vector can be set to trigger
on a rising edge, a falling edge, or either edge.
The signal on the external interrupt pin must be present for at least three peripheral clock
cycles to be detected. In addition, the Rabbit 4000 has a minimum latency of 10 clocks to
respond to an interrupt, so the minimum external interrupt response time is three periph-
eral clock cycles plus 10 processor clock cycles.
7.2 Block Diagram
Chapter 7 External Interrupts
69