Interrupt vectors 0 to 31 are usually reserved for microprocessor interrupts. The remainder can be used for hardware or software interrupts. The interrupt type number determines its place within the interrupt vector table and its priority (with the exception of the NMI interrupt (2), but has the...
6.1.2 The 16F84A interrupt structure The 16F84A has four interrupt sources, all of which can be individually enabled or disabled: • External interrupt. This is the only external interrupt input. It shares a pin with Port B, bit 0 (Figure 2.1). It is edge triggered. • Timer overfl...
The amount of physical memory a microprocessor can access depends on the number of address lines that emanate from the chip. Each additional bit doubles the amount of addressable memory. The 8086 can address one Megabyte of memory, which requires a 20-bit address. Rather than introduce a 20-b...
A data collection terminal includes a microprocessor, a memory and a number of devices coupled to a system bus. An interrupt controller processes the device interrupt requests by sending a vector address out on the system bus to enable the microprocessor to branch to a microprogram to process the...
CPU 15 may be any type of processor designed to do any type of process function. One example would be the INTEL 8086 microprocessor. Shared memory 13 may be any type of random access memory, such as Mostek MK 4802. Programmable interrupt controller 14 may be an INTEL 8259A which serves ...
As far as the Interrupt Priority in 8086 are concerned, software interrupts (All interrupts except single step, NMI and INTR interrupts) have the highest
Interrupt vectors 0 to 31 are usually reserved for microprocessor interrupts. The remainder can be used for hardware or software interrupts. The interrupt type number determines its place within the interrupt vector table and its priority (with the exception of the NMI interrupt (2), but has the...
(a) The interrupt vector table for the Intel microprocessor; (b) the contents of an interrupt vector. In an interrupt vector table, the first five interrupt vectors are identical in all Intel microprocessor family members, from the 8086 to the Pentium. Other interrupt vectors exist for the ...
(a) The interrupt vector table for the Intel microprocessor; (b) the contents of an interrupt vector. In an interrupt vector table, the first five interrupt vectors are identical in all Intel microprocessor family members, from the 8086 to the Pentium. Other interrupt vectors exist for the ...