Copy Microcontroller PIC16F74 Code from its flash memory, the embedded original firmware inside PIC16F74 MCU can be recovered.
If the code protection bit has not been programmed, the on-chip program memory can be read out for verification process. The first 64 locations can be read by the PIC16F74 regardless of the code protection bit setting from the process of Extract MCU ATMEGA164 Code.
The last memory location cannot be read if code protection is enabled on the PIC16F74. The last memory location can be read regardless of the code protection bit setting on the PIC16F74.
Four memory locations are designated as ID locations where the user can store checksum or other code-identification numbers. These locations are not accessible during normal execution but are readable and writable during program/verify process after Extract IC ATMEGA861A Code.
Use only the lower 4 bits of the ID locations and always program the upper 8 bits as ’0’s. The PIC16F74 microcontrollers with EPROM program memory can be serially programmed while in the end application circuit.
This is simply done with two lines for clock and data, and three other lines for power, ground, and the programming voltage. This allows customers to manufacture boards with unprogrammed devices for the purpose of Read MCU ATMEGA461A Software, and then program the microcontroller just before shipping the product.
This also allows the most recent firmware or a custom firmware to be programmed. The device is placed into a program/verify mode by holdin g the GP1 and GP0 pins low while raising the MCLR (VPP) pin from VIL to VIHH (see programming specification).
GP1 becomes the programming clock and GP0 becomes the programming data. Both GP1 and GP0 are Schmitt Trigger inputs in this mode. After reset, a 6-bit command is then supplied to the device. Depending on the command, 14-bits of program data are then supplied to or from the device, depending if the command was a load or a read before Copy Microcontroller PIC16F74 Code.
For complete details of serial programming, please refer to the PIC12C5XX Programming Specifications. A typical in-circuit serial programming connection is shown in Figure 8-16 after Unlock Microcontroller.
