7.5.2 Interrupt controller
The diagram below gives an overview about the interrupt controller.
Each register of the interrupt controller provides one dedicated bit for each raw
interrupt source.
The raw interrupts are generated inside the Video Output module. Depending on
the interrupt controller configuration a raw interrupt can generate a system
interrupt to outside the Video Output module.
unmask
ed sta
tus
mask
ed sta
tus
VOnLCDRIS
or
MBEINT
Raw
interrupts
System
interrupts
FUFINT
NBAINT
VCPINT
VOnMBEINT
VOnFUFINT
VOnNBAINT
VOnVCPINT
VOnINT
enable/mask
VOnLCDIMSC
MBERRORIM
VCOMPIM
LNBUIM
FUFIM
hold/clear
VOnLCDICR
VOnLCDMIS
MBERRORIC
VCOMPIC
LNBUIC
FUFIC
Figure 7-5 Interrupt controller
VOnLCDRIS
The read-only LCD raw interrupt status register VOnLCDRIS reflects the
occurence of any raw interrupt. Any of the bits set here can generate a system
interrupt, provided it is enabled, i.e. unmasked.
VOnLCDIMSC
Any of the raw interrupts can be enabled (unmasked) respectively disabled
(masked) by setting respectively resetting the corresponding bit in the LCD
interrupt mask register VOnLCDIMSC.
The interrupt is enabled (unmasked), if its mask bit in VOnLCDIMSC is set to 1.
A disabled (masked) raw interrupt can not generate a system interrupt to outside
the Video Output module.
VOnLCDICR
Any unmasked interrupt, that has occured is saved and generates a system
interrupt to outside the Video Output module. A saved interrupt can be cleared
by writing to its corresponding bit in the write-only LCD interrupt clear register
VOnLCDICR.
VOnLCDMIS
The read-only LCD masked interrupt status register VOnLCDMIS shows which
system interrupts are currently active.
Video Output
Chapter 7
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