ST7263BK2 STMicroelectronics, ST7263BK2 Datasheet - Page 38

• Manufacturer Part Number: ST7263BK2
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 32K FLASH/ROM, DFU CAPABILITY, 8-BIT ADC, WDG, TIMER, SCI and I2C
• Manufacturer: STMicroelectronics

Specifications of ST7263BK2

• 4, 8, 16 Or 32 Kbytes Program Memory: high density Flash (HDFlash), FastROM or ROM with Read-Out and Write protection

Interrupts
Note:
38/186
1
2
3
Peripheral interrupts
Different peripheral interrupt flags in the status register are able to cause an interrupt when
they are active if both:
●
●
If any of these two conditions is false, the interrupt is latched and thus remains pending.
Clearing an interrupt request is done by one of the two following operations:
●
●
The clearing sequence resets the internal latch. A pending interrupt (i.e. waiting to be
enabled) will therefore be lost if the clear sequence is executed.
All interrupts allow the processor to leave the Wait low power mode.
Exit from Halt mode may only be triggered by an external interrupt on one of the ITi ports
(PA4-PA7 and PB4-PB7), an end suspend mode interrupt coming from USB peripheral, or a
reset.
Figure 19. Interrupt processing flowchart
FROM RESET
The I bit of the CC register is cleared.
The corresponding enable bit is set in the control register.
Writing “0” to the corresponding bit in the status register.
Accessing the status register while the flag is set followed by a read or write of an
associated register.
EXECUTE INSTRUCTION
Doc ID 7516 Rev 8
RESTORE PC, X, A, CC FROM STACK
THIS CLEARS I BIT BY DEFAULT
FETCH NEXT INSTRUCTION
N
BIT I SET
IRET
Y
Y
N
LOAD PC FROM INTERRUPT VECTOR
N
STACK PC, X, A, CC
INTERRUPT
SET I BIT
Y
ST7263Bxx