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ST10F273E Datasheet(PDF) 55 Page - STMicroelectronics

Part No. ST10F273E
Description  16-bit MCU with 512 Kbyte Flash memory and 36 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F273E Datasheet(HTML) 55 Page - STMicroelectronics

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ST10F273E
Interrupt system
55/179
When different sources submit an interrupt request, the enable bits (Byte High of XIRxSEL
register) define a mask which controls which sources will be associated with the unique
available vector. If more than one source is enabled to issue the request, the service routine
will have to take care to identify the real event to be serviced. This can easily be done by
checking the flag bits (Byte Low of XIRxSEL register). Note that the flag bits can also
provide information about events which are not currently serviced by the interrupt controller
(since masked through the enable bits), allowing an effective software management also in
absence of the possibility to serve the related interrupt request: a periodic polling of the flag
bits may be implemented inside the user application.
Figure 7.
X-Interrupt basic structure
The
Table 30 summarizes the mapping of the different interrupt sources which shares the
four X-interrupt vectors.
Table 30.
X-Interrupt detailed mapping
XP0INT
XP1INT
XP2INT
XP3INT
CAN1 interrupt
x
x
CAN2 interrupt
x
x
I2C receive
x
x
x
I2C transmit
x
x
x
I2C error
x
SSC1 receive
x
x
x
SSC1 transmit
x
x
x
SSC1 error
x
ASC1 receive
x
x
x
ASC1 transmit
x
x
x
ASC1 transmit buffer
x
x
x
ASC1 error
x
XIRxSEL[7:0] (x = 0, 1, 2, 3)
XIRxSEL[15:8] (x = 0, 1, 2, 3)
XPxIC.XPxIR (x = 0, 1, 2, 3)
7
0
15
8
IT Source 7
IT Source 6
IT Source 5
IT Source 4
IT Source 3
IT Source 2
IT Source 1
IT Source 0
Enable[7:0]
Flag[7:0]


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