MCU PIC18LF448 Heximal Copying will need to disable the secured bits by focus ion beam through microcontroller unlock technique and then duplicate the program and data from its flash and eeprom memory.
The XMEGA A1 has a powerful On-Chip Debug (OCD) system that – in combination with Atmel’s development tools – provides all the necessary functions to debug an application. It has support for program and data breakpoints, and can debug an application from C and high level language source code level, as well as assembler and disassembler level. It has full Non-Intrusive Operation and no hardware or software resources in the device are used. The ODC system is accessed through an external debugging tool which connects to the JTAG or PDI physical interfaces when copy heximal from mcu.
Refer to “Program and Debug Interfaces” on page 47. The programming and debug facilities are accessed through the JTAG and PDI physical interfaces. The PDI physical uses one dedicated pin together with the Reset pin, and no general purpose pins are used. JTAG uses four general purpose pins on PORTB.The JTAG physical layer handles the basic low-level serial communication over four I/O lines named TMS, TCK, TDI, and TDO. It complies to the IEEE Std. 1149.1 for test access port and boundary scan before the hex of mcu can be copied.
The pinout of XMEGA A1 is shown in “Pinout/Block Diagram” on page 2. In addition to general I/O functionality, each pin may have several functions. This will depend on which peripheral is enabled and connected to the actual pin. Only one of the alternate pin functions can be used at time.The tables below show the primary/default function for each pin on a port in the first column, the pin number in the second column, and then all alternate pin functions in the remaining columns after the mcu heximal being copied.
The head row shows what peripheral that enable and use the alternate pin functions.
1. Bootloader Section in Flash is non-functional
The Bootloader Section is non-functional, and bootloader or application code cannot reside in this part of the Flash.
Problem fix/Workaround None, do not use the Bootloader Section.
2. Bandgap voltage input for the ACs cannot be changed when used for both ACs simultaneously
If the Bandgap voltage is selected as input for one Analog Comparator (AC) and then selected/deselected as input for the another AC, the first comparator will be affected for up to 1 us and could potentially give a wrong comparison result.
Problem fix/Workaround
If the Bandgap is required for both ACs simultaneously, configure the input selection for both ACs before enabling any of them.
3. DAC is nonlinear and inaccurate when reference is above 2.4V
Using the DAC with a reference voltage above 2.4V give inaccurate output when converting codes that give below 0.75V output:
– ±20 LSB for continuous mode
– ±200 LSB for Sample and Hold mode
Problem fix/Workaround
None, avoid using a voltage reference above 2.4V.
