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ST72321BXXX-AUTO Datasheet(PDF) 62 Page - STMicroelectronics

Part # ST72321BXXX-AUTO
Description  8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321BXXX-AUTO Datasheet(HTML) 62 Page - STMicroelectronics

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Interrupts
ST72321Bxxx-Auto
62/247
7.6
External interrupts
7.6.1
I/O port interrupt sensitivity
The external interrupt sensitivity is controlled by the IPA, IPB and ISxx bits of the EICR
register (Figure 21). This control allows to have up to four fully independent external
interrupt source sensitivities.
Each external interrupt source can be generated on four (or five) different events on the pin:
●
Falling edge
●
Rising edge
●
Falling and rising edge
●
Falling edge and low level
●
Rising edge and high level (only for ei0 and ei2)
Table 19.
Interrupt mapping
No.
Source
block
Description
Register
label
Priority
order
Exit
from
Halt /
Active
Halt
Address
vector
RESET
Reset
N/A
yes
FFFEh-FFFFh
TRAP
Software interrupt
no
FFFCh-FFFDh
0
TLI
External top level interrupt
EICR
yes
FFFAh-FFFBh
1
MCC/RTC Main clock controller time base interrupt
MCCSR
Higher
priority
yes
FFF8h-FFF9h
2
ei0
External interrupt port A3..0
N/A
yes
FFF6h-FFF7h
3
ei1
External interrupt port F2..0
yes
FFF4h-FFF5h
4
ei2
External interrupt port B3..0
yes
FFF2h-FFF3h
5
ei3
External interrupt port B7..4
yes
FFF0h-FFF1h
6
Not used
FFEEh-FFEFh
7
SPI
SPI peripheral interrupts
SPICSR
yes(1)
FFECh-FFEDh
8
TIMER A
TIMER A peripheral interrupts
TASR
no
FFEAh-FFEBh
9
TIMER B
TIMER B peripheral interrupts
TBSR
no
FFE8h-FFE9h
10
SCI
SCI peripheral interrupts
SCISR
Lower
priority
no
FFE6h-FFE7h
11
AVD
Auxiliary voltage detector interrupt
SICSR
no
FFE4h-FFE5h
12
I2C
I2C peripheral interrupts
(see
peripheral)
no
FFE2h-FFE3h
13
PWM ART
PWM ART interrupt
ARTCSR
yes(2)
FFE0h-FFE1h
1.
Exit from HALT possible when SPI is in slave mode.
2.
Exit from HALT possible when PWM ART is in external clock mode.


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