Programmable Interrupt Controller
CMOS Peripherals _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
CDP1877, CDP1877C
CASCAi5E iR7 iRS iRS
IR4
iR3 iRl...
Description
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 ...
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