ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 60

• Manufacturer Part Number: ST72344S4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72344S4

• Up To 16 Kbytes Program Memory: single voltage extended Flash (XFlash) with readout and write protection, in-circuit and inapplication programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
• 256 Bytes Data Eeprom With Readout Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: crystal/ceramic resonator oscillators, high-accuracy internal RC oscillator or external clock
• 5 Power-saving Modes: Slow, Wait, Halt, Auto-wakeup from Halt and Active-halt
• 16-bit Timer A With: 1 input capture, 1 output compares, external clock input, PWM and pulse generator modes
• 16-bit Timer B With: 2 input captures, 2 output compares, PWM and pulse generator modes

Interrupts
8.6
8.6.1
60/247
External interrupts
I/O port interrupt sensitivity
The external interrupt sensitivity is controlled by the IPA, IPB and ISxx bits of the EICR
register
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.
Figure 24. External interrupt control bits
PF2
PB4
PA3
PB3
PORT F [2:0] INTERRUPTS
PORT B4 INTERRUPT
Falling edge
Rising edge
Falling and rising edge
Falling edge and low level
Rising edge and high level (only for ei0 and ei2)
PORT A3, E1 INTERRUPTS
PORT B [3:0] INTERRUPTS
PFDDR.2
PBDDR.4
(Figure
PADDR.3
PBDDR.3
PFOR.2
PBOR.4
PAOR.3
PBOR.3
IPA BIT
IPB BIT
24). This control allows to have up to 4 fully independent external interrupt
Doc ID 12321 Rev 5
SENSITIVITY
SENSITIVITY
IS20
IS10
SENSITIVITY
SENSITIVITY
IS20
IS10
CONTROL
CONTROL
CONTROL
CONTROL
EICR
EICR
EICR
EICR
IS21
IS11
IS21
IS11
PF2
PF1
PF0
PB4
PA3
PE1
PB3
PB2
PB1
PB0
ST72344xx ST72345xx
ei1 INTERRUPT SOURCE
ei3 INTERRUPT SOURCE
ei0 INTERRUPT SOURCE
ei2 INTERRUPT SOURCE