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There are a number of common priority schemas in PICs including hard priorities, specific priorities, and rotating priorities. Interrupts may be either edge triggered or level triggered. There are a number of common ways of acknowledging an interrupt has completed when an EOI is issued.
Introduced in 1979, this expanded PIC supported 64 bytes of register space (16 special function registers and 48 bytes of RAM), 1024 words of ROM, a 6-level hardware stack, and interrupt handling. The PIC1665 was a variant with external ROM used for developing firmware for the mask ROM 1670.
Various older (EPROM) PIC microcontrollers. The original PIC was intended to be used with General Instrument's new CP1600 16-bit central processing unit (CPU). In order to fit 16-bit data and address buses into a then-standard 40-pin dual inline package (DIP) chip, the two buses shared the same set of 16 connection pins.
In computing, position-independent code [1] (PIC [1]) or position-independent executable (PIE) [2] is a body of machine code that executes properly regardless of its memory address. [ a ] PIC is commonly used for shared libraries , so that the same library code can be loaded at a location in each program's address space where it does not ...
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The 8259 may be configured to work with an 8080/8085 or an 8086/8088. On the 8086/8088, the interrupt controller will provide an interrupt number on the data bus when an interrupt occurs. The interrupt cycle of the 8080/8085 will issue three bytes on the data bus (corresponding to a CALL instruction in the 8080/8085 instruction set).
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The interexchange carrier to which calls from a subscriber line are routed by default is known as the presubscribed interexchange carrier (PIC). To give telephone users the possibility of opting for a different carrier on a call-by-call basis, carrier access codes (CAC) were devised. These consist of the digits 101 followed by the four-digit CIC.