ST72321AR6-Auto STMicroelectronics, ST72321AR6-Auto Datasheet - Page 57

• Manufacturer Part Number: ST72321AR6-Auto
• Description: 8-bit MCU for automotive with 32 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
• Manufacturer: STMicroelectronics

Specifications of ST72321AR6-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

ST72321xx-Auto
7.6
7.6.1
External interrupts
I/O port interrupt sensitivity
The external interrupt sensitivity is controlled by the IPA, IPB and ISxx bits of the EICR
register
interrupt source sensitivities.
Each external interrupt source can be generated on four (or five) different events on the pin:
●
●
●
●
●
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.
Falling edge
Rising edge
Falling and rising edge
Falling edge and low level
Rising edge and high level (only for ei0 and ei2)
(Figure
21). This control allows to have up to four fully independent external
Doc ID 13829 Rev 1
Interrupts
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