CHAPTER 9: External Interrupt and NMI Control Sections
438 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
1. Overview
The external interrupt and NMI control sections have the following features.
− Has up to 32 external interrupt input pins and one NMI input pin mounted.
− Possible to select the H level, L level, rising edge, or falling edge to detect an external interrupt.
Possible to select the both rising and falling edges in TYPE5-M4 and TYPE6-M4 products.
− Possible to use an external interrupt input or NMI input to return from standby mode.
2. Block Diagram
The following shows the block diagram of the external interrupt and NMI control sections.
Figure 2-1 Block Diagram of External Interrupt and NMI Control Sections
Level detection
Nornal : Falling edge
Stop release : “L” level
Factor F/F
NMIRR
Non Maskable Interrupt Factor Register
NMICL
Non Maskable Interrupt Factor Clear Register
NMIIRQ
NMIX
Level
detection
Interupt
EN gate
EIRR
External Interrupt Factor Register
ENIR
External Interrupt Enable Register
INTIRQxx
INTxx
ELVR
External Interrupt Factor LevelRegister
EICL
External Interrupt Factor Clear Register
APB-BUS
factor F/F
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