CDP1877

CMOS Peripherals _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ CDP1877, CDP1877C CASCAi5E iR7 iRS iRS IR4 iR3 iRl! iRi iRO TPA TPB MWR MRD VSS I 28 VDD 2 27 8US7 3 26 8US6 4 25 BUS 5 5 24 8US4 6 23 8US 3 7 22 8US2 8 21 BUSI 9 20 BUSO 10 19 CS/Ax II 18 CS/Ay 12 17 CS 13 16 cs 14 15 iNT TOP VIEW 92CS-34371 TERMINAL ASSIGNMENT Programmable Interrupt Controller (PIC) Features: Compatible with CDP1800 series Programmable long branch vector address and vector interval 8 levels of interrupt per chip Easily expandable Latched interrupt requests Hard wired interrupt priorities Memory mapped Multiple chip select inputs to minimize address space requirements The RCA-COP1877 and CDP1877C. are programmable 8level interrupt controllers designed for use in CDP1800series microprocessor systems. They provide added versatilty by extending the number of permissible interrupts from 1 to N in increments of 8. When a high to low transition occurs on any of the PIC ...