ST72321BXXX-AUTO datasheet(63/247 Pages) 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]

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ST72321Bxxx-Auto

Interrupts

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To guarantee correct functionality, the sensitivity bits in the EICR register can be modified

only when the I1 and I0 bits of the CC register are both set to 1 (level 3). This means that

interrupts must be disabled before changing sensitivity.

The pending interrupts are cleared by writing a different value in the ISx[1:0], IPA or IPB bits

of the EICR.

Figure 21.

External interrupt control bits

IS10

IS11

EICR

SENSITIVITY

CONTROL

PBOR.3

PBDDR.3

IPB BIT

PB3

ei2 INTERRUPT SOURCE

PORT B [3:0] INTERRUPTS

PB3

PB2

PB1

PB0

IS10

IS11

EICR

SENSITIVITY

CONTROL

PBOR.7

PBDDR.7

PB7

ei3 INTERRUPT SOURCE

PORT B [7:4] INTERRUPTS

PB7

PB6

PB5

PB4

IS20

IS21

EICR

SENSITIVITY

CONTROL

PAOR.3

PADDR.3

IPA BIT

PA3

ei0 INTERRUPT SOURCE

PORT A [3:0] INTERRUPTS

PA3

PA2

PA1

PA0

IS20

IS21

EICR

SENSITIVITY

CONTROL

PFOR.2

PFDDR.2

PF2

ei1 INTERRUPT SOURCE

PORT F [2:0] INTERRUPTS

PF2

PF1

PF0

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