ST7LITE49K2 STMicroelectronics, ST7LITE49K2 Datasheet - Page 57

• Manufacturer Part Number: ST7LITE49K2
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49K2

• 8 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10K write/erase cycles guaranteed Data retention
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow

ST7LITE49K2
Note:
8.3
Note:
Maskable sources
Maskable interrupt vector sources can be serviced if the corresponding interrupt is enabled
and if its own interrupt software priority (in ISPRx registers) is higher than the one currently
being serviced (I1 and I0 in CC register). If any of these two conditions is false, the interrupt
is latched and thus remains pending.
●
●
The clearing sequence resets the internal latch. A pending interrupt (that is, waiting for
being serviced) will therefore be lost if the clear sequence is executed.
Interrupts and low power modes
All interrupts allow the processor to exit the Wait low power mode. On the contrary, only
external and other specified interrupts allow the processor to exit from the Halt modes (see
column “Exit from Halt” in
pending interrupts are present while exiting Halt mode, the first one serviced can only be an
interrupt with exit from Halt mode capability and it is selected through the same decision
process shown in
If an interrupt, that is not able to Exit from Halt mode, is pending with the highest priority
when exiting Halt mode, this interrupt is serviced after the first one serviced.
External interrupts
External interrupts allow the processor to exit from Halt low power mode.
External interrupt sensitivity is software selectable through the External Interrupt
Control register (EICR).
External interrupt triggered on edge will be latched and the interrupt request
automatically cleared upon entering the interrupt service routine.
If several input pins of a group connected to the same interrupt line are selected
simultaneously, these will be logically ORed.
Peripheral interrupts
Usually the peripheral interrupts cause the MCU to exit from Halt mode except those
mentioned in
A peripheral interrupt occurs when a specific flag is set in the peripheral status
registers and if the corresponding enable bit is set in the peripheral control register.
The general sequence for clearing an interrupt is based on an access to the status
register followed by a read or write to an associated register.
Figure
Table 18: ST7LITE49K2 interrupt
21.
Table 18: ST7LITE49K2 interrupt
mapping.
mapping). When several
Interrupts
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