Rabbit OP7100 User Manual download pdf (Page 107)

OP7100 Memory, I/O Map, and Interrupt Vectors



 107

Power-Failure Interrupts

The INT1 line is connected to the power-failure output of the ADM691

supervisor. A power-failure interrupt occurs when PFI falls to 1.25 V ±

0.05 V. This advanced warning allows the program to perform some

emergency processing before an unwanted power-down occurs.

The following example shows how to handle a power-failure interrupt.

#INT

VEC INT1

VEC power_fail_isr

interrupt power_fail_isr(){

IRES(ITC,1);

// clear bit 1 of ITC and disable /INT1

body of interrupt routine

}

You also need to add the following line to main().

ISET(ITC,1) // enables /INT1

Interrupt Priorities

Table C-6 lists the interrupt priorities.

Table C-6. Interrupt Priorities

Interrupt Priorities

(Highest Priority) Trap (illegal instruction)

NMI (nonmaskable interrupt)

INT 0 (maskable interrupts, Level 0; three modes)

INT 1 (maskable interrupts, Level 1; PLCBus

attention line interrupt)

INT 2 (maskable interrupts, Level 2)

PRT Timer Channel 0

PRT Timer Channel 1

DMA Channel 0

DMA Channel 1

Z180 Serial Port 0

(Lowest Priority) Z180 Serial Port 1

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 125 126

No comments

Rabbit OP7100 User Manual Page 107