ST7260E1 STMicroelectronics, ST7260E1 Datasheet - Page 31

• Manufacturer Part Number: ST7260E1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 8K FLASH/ROM AND SERIAL COMMUNICATION INTERFACE (SCI)
• Manufacturer: STMicroelectronics

Specifications of ST7260E1

• 4 Or 8 Kbytes Program Memory: high density Flash (HDFlash), or FastROM with readout and write protection

ST7260xx
Note:
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:
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●
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 16. Interrupt processing flowchart
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.
FROM RESET
EXECUTE INSTRUCTION
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
Interrupts
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