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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.