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CHAPTER 6 EXTERNAL INTERRUPT/NMI
CONTROLLER
This chapter explains the general outlines of the external interrupt/NMI controller,
configuration/functions of registers, and operations of the external interrupt/NMI
controller.
6.1 Overview of External Interrupt/NMI Controller
6.2 Enable Interrupt Request Register (ENIR)
6.3 External Interrupt Request Register (EIRR)
6.4 External Level Register (ELVR)
6.5 External Interrupt Operation
6.6 External Interrupt Request Levels
6.7 Nonmaskable Interrupt (NMI) Operation