USC68HC908

The USC68HC908 is designed as a 7 channel programmable interrupt controller (PIC) that has been designed to interface directly to the 68000 family of micro-processors. This low power CMOS device provides the user wih advanced interrupt control features in a space saving 24 pin, slim line package. The on chip DTACK generation enables the PIC to appear to the 68000 in the same manner as memory. The single line chip select minimizes the amount of decode logic required to address the PIC.

USC68HC908 has eight features. (1)Interfaces directly to the 68000. (2)DTACK generated on chip. (3)No system clock required. (4)7 prioritized interrupt channels 4 edge activated and 3 level activated. (5)Interrupts controlled through 5 internal registers which means interrupt pending register, interrupt mask register, interrupt enable register, interrupt in service register and interrupt vector register. (6)Fully TTL compatible. (7)High speed, low power, CMOS process. (8)Space saving 24 pin, 300 mil. package. Those are all the main features.

The USC68HC908 can be incorporated into a 68000 based system. Each chip is capable of monitoing and prioritizing up to 7 channels of interrupt with automatic nesting. To maximize the versatility of the PIC both edge and level activated inputs are provided. All inputs can be selectively enable or disabled by programming the internal registers of the chip accordingly. These advanced features allow many interrupt functions normally handled in software to be performed with a single chip.

About USC68HC908's operation, it interfaces 7 channels of interrupt directly to the 68000 microprocessor. After the PIC is programmed USC68HC908 continuously monitors all the specified interrupt channels. When an interrupt is received that has a higher priority then any currently pending or in service an interrupt request is transmitted to the processor. When the interrupt is acknowledged the PIC automatically responds by transmitting the interrupt vector number to the processor. And so on. If you have any question or suggestion or want to know more information please contact us for details. Thank you!