MC56F836 Freescale Semiconductor, Inc, MC56F836 Datasheet - Page 82

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MC56F836

Manufacturer Part Number
MC56F836
Description
56f8300 16-bit Digital Signal Controllers
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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5.4 Block Diagram
5.5 Operating Modes
The ITCN module design contains two major modes of operation:
82
Functional Mode
The ITCN is in this mode by default.
Wait and Stop Modes
During Wait and Stop modes, the system clocks and the 56800E core are turned off. The ITCN will signal
a pending IRQ to the System Integration Module (SIM) to restart the clocks and service the IRQ. An IRQ
can only wake up the core if the IRQ is enabled prior to entering the Wait or Stop mode. Also, the IRQA
and IRQB signals automatically become low-level sensitive in these modes, even if the control register bits
are set to make them falling-edge sensitive. This is because there is no clock available to detect the falling
edge.
A peripheral which requires a clock to generate interrupts will not be able to generate interrupts during Stop
mode. The FlexCAN module can wake the device from Stop, and a reset will do just that, or IRQA and
IRQB can wake it up.
INT1
INT82
Decode
Decode
Priority
Priority
Level
Level
2 -> 4
2 -> 4
Figure 5-1 Interrupt Controller Block Diagram
56F8365 Technical Data, Rev. 7
Level 0
Level 3
Encoder
Encoder
Priority
Priority
82 -> 7
82 -> 7
7
7
any0
any3
IACK
SR[9:8]
CONTROL
PIC_EN
Freescale Semiconductor
INT
VAB
IPIC
Preliminary

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