Unlock Microcontroller ATMEGA168PA Heximal

We can Unlock Microcontroller ATMEGA168PA Heximal, please view the Microcontroller ATMEGA168PA features for your reference:

The internal oscillator provides a 4 MHz (nominal) system clock (see Section 12.0 “Electrical Characteristics” for information on variation over voltage and temperature) when Unlock Microcontroller.

In addition, a calibration instruction is programmed into the last address of memory, which contains the calibration value for the internal oscillator if Unlock Microcontroller.

This location is always uncode protected, regardless of the code-protect settings. This value is programmed as a MOVLW xx instruction where xx is the calibration value and is placed at the Reset vector before Unlock Microcontroller.

This will load the W register with the calibration value upon Reset and the PC will then roll over to the users program at address 0x000 after Unlock Microcontroller.

The user then has the option of writing the value to the OSCCAL Register (05h) or ignoring it. OSCCAL, when written to with the calibration value, will “trim” the internal oscillator to remove process variation from the oscillator frequency when Unlock Microcontroller.

The device differentiates between various kinds of Reset:

· Power-on Reset (POR)

· MCLR Reset during normal operation

· MCLR Reset during Sleep if Unlock Microcontroller

· WDT time-out Reset during normal operation

· WDT time-out Reset during Sleep

Wake-up from Sleep on pin change

Wake-up from Sleep on comparator change before Unlock Microcontroller

Some registers are not reset in any way, they are unknown on POR and unchanged in any other Reset.

Most other registers are reset to “Reset state” on Power-on Reset (POR), MCLR, WDT or Wake-up on pin change Reset during normal operation after Unlock Microcontroller.

They are not affected by a WDT Reset during Sleep or MCLR Reset during Sleep, since these Resets are viewed as resumption of normal operation if Unlock Microcontroller.

The exceptions to this are TO, PD, GPWUF and CWUF bits. They are set or cleared differently in different Reset situations. These bits are used in software to determine the nature of Reset when Unlock Microcontroller.

See Table 9-1 for a full description of Reset states of all registers.


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