L64780 LSI Logic Corporation, L64780 Datasheet - Page 61

• Manufacturer Part Number: L64780
• Description: Dvb-t Cofdm Demodulator Technical Manual 2/00
• Manufacturer: LSI Logic Corporation

4.2.2 Interrupt Mask Register, Address Line 0x01
The microprocessor can select between a polling or interrupt driven
approach by programming the Interrupt Mask register. Only when the bit
in the Interrupt Mask register associated with the event bit in the Interrupt
register is set to 1 is the interrupt for this event is enabled; otherwise,
polling is selected.
Any interrupt-related events reported in the Interrupt register lead to the
assertion of the INTn signal (active LOW). On receiving an interrupt
signal, the microcontroller is expected to read the Interrupt register to
identify the cause(s) of this interrupt. The microcontroller thereby resets
all interrupt events in the Interrupt register; this remains in effect until a
new interrupt (TPS info change or Sync change) occurs. To disable
permanently the interrupt mechanism, reset the Interrupt Mask register.
Figure 4.4
Figure 4.4
Event
Interrupt Registers
Mask
i
i
shows an implementation of the interrupt generation.
Interrupt Generation
AND
From other interrupts
OR
INT
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