System Integration Unit (SIU)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
6-7
When the counter for an IRQ is not enabled, the state of the IRQ is held in the current and previous state
latches. The IRQ counter operates independently of the IRQ or overrun flag bit. Clearing the IRQ flag or
overrun flag bits does not clear or reload the counter.
Refer to the following sections for more information:
Section 6.3.1.4, “External Interrupt Status Register (SIU_EISR)
”
Section 6.3.1.9, “IRQ Rising-Edge Event Enable Register (SIU_IREER)
”
Section 6.3.1.10, “IRQ Falling-Edge Event Enable Register (SIU_IFEER)
”
Section 6.3.1.11, “IRQ Digital Filter Register (SIU_IDFR)
”
6.2.1.6.1
External Interrupts
The IRQ signals map to 16 independent interrupt requests output from the SIU. The IRQ flag bit is set
when a rising-edge and/or falling-edge event occurs for the IRQ. An external IRQ signal is asserted when
all of the following occur:
•
Enable bit is set in the IRQ rising- and/or falling-edge event registers (SIU_IREER, SIU_IFEER)
•
IRQ flag bit is set in the external interrupt status register (SIU_EISR)
•
Enable bit is cleared in the DMA/interrupt request enable register (SIU_DIRER)
•
Select bit is cleared in the DMA/interrupt select register (SIU_DIRSR)
Refer to the following sections for more information:
Section 6.3.1.5, “DMA/Interrupt Request Enable Register (SIU_DIRER)
”
Section 6.3.1.6, “DMA/Interrupt Request Select Register (SIU_DIRSR)
”
6.2.1.6.2
DMA Transfers
DMA IRQ signals (IRQ[0] through IRQ[3]) map to four independent DMA transfer
or
interrupt request
outputs configured in the SIU. A DMA transfer or interrupt request asserts when all of the following occur:
•
IRQ flag bit is set in the external interrupt status register (SIU_EISR)
•
Enable bit is set in the DMA transfer or interrupt request enable register (SIU_DIRER)
•
Select bit is set in the DMA transfer or interrupt request select register (SIU_DIRSR)
The SIU receives a ‘DMA transfer done’ signal for each DMA or interrupt request transmitted.
When the ‘DMA done’ signal asserts, the IRQ flag bit is cleared.
Refer to the following sections for more information:
Section 6.3.1.5, “DMA/Interrupt Request Enable Register (SIU_DIRER)
Section 6.3.1.6, “DMA/Interrupt Request Select Register (SIU_DIRSR)
Summary of Contents for MPC5565
Page 18: ...MPC5565 Microcontroller Reference Manual Devices Supported MPC5565 MPC5565 RM Rev 1 0 09 2007...
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Page 553: ...Flash Memory MPC5565 Microcontroller Reference Manual Rev 1 0 13 38 Freescale Semiconductor...
Page 559: ...SRAM MPC5565 Microcontroller Reference Manual Rev 1 0 14 6 Freescale Semiconductor...
Page 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Page 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...