Read IC PIC12F683 Software means the firmware embedded in the microcontroller PIC12F683 memory such as flash and eeprom can be dump out after unlock MCU tamper resistance system;

Pin RA4 is multiplexed with the Timer0 module clock input to become the RA4/T0CKI pin. The RA4/T0CKI pin is a Schmitt Trigger input and an open drain output when extract ic at89c4051 code.

All other PORTA pins have TTL input levels and full CMOS output drivers. Other PORTA pins are multiplexed with analog inputs and analog VREF input.

The operation of each pin is selected by clearing/setting the control bits in the ADCON1 register (A/D Control Register1). The TRISA register controls the direction of the RA pins, even when they are being used as analog inputs.

The user must ensure the bits in the TRISA register are maintained set, when using them as analog inputs. PORTB is an 8-bit wide, bi-directional port. The corresponding data direction register is TRISB after extract microcontroller code.

Setting a TRISB bit (= ‘1’) will make the corresponding PORTB pin an input (i.e., put the corresponding output driver in a Hi-Impedance mode). Clearing a TRISB bit (= ‘0’) will make the corresponding PORTB pin an output (i.e., put the contents of the output latch on the selected pin) when extract microcontroller at89s53 code.

Each of the PORTB pins has a weak internal pull-up. A single control bit can turn on all the pull-ups. This is performed by clearing bit RBPU (OPTION_REG<7>).

The weak pull-up is automatically turned off when the port pin is configured as an output. The pull-ups are disabled on a Power-on Reset.