Copy IC PIC16F873A Eeprom content and program of flash memory to blank Microcontroller PIC16F873A after crack MCU tamper resistance system, disable its security fuse in order to readout the code;
A read from the PSP occurs when both the CS and RD lines are detected low. The data in the PORTD output latch is output to the PORTD pins.
The Output Buffer Full (OBF) status flag bit (TRISE<6>) is cleared immediately (Figure 4-10), indicating that the PORTD latch is being read, or has been read by the external bus when extract IC pic16c57c code.
If firmware writes new data to the output latch during this time, it is immediately output to the PORTD pins, but OBF will remain cleared.
The Timer0 module timer/counter has the following features:
8-bit timer/counter Readable and writable
8-bit software programmable prescaler
Internal or external clock select
Interrupt on overflow from FFh to 00h
Edge select for external clock if extract mcu pic12c508a code
Additional information on the Timer0 module is available in the PICmicro™ Mid-Range MCU Family Reference Manual (DS33023).
Figure 5-1 is a block diagram of the Timer0 module and the prescaler shared with the WDT. Timer0 operation is controlled through the OPTION_REG register (Register 5-1 on the following page).
Timer mode is selected by clearing bit T0CS (OPTION_REG<5>). In Timer mode, the Timer0 module will increment every instruction cycle (without prescaler).
If the TMR0 register is written, the increment is inhibited for the following two instruction cycles. The user can work around this by writing an adjusted value to the TMR0 register.
Counter mode is selected by setting bit T0CS (OPTION_REG<5>). In Counter mode, Timer0 will increment, either on every rising or falling edge of pin RA4/T0CKI.
The incrementing edge is determined by the Timer0 Source Edge Select bit T0SE (OPTION_REG<4>). Clearing bit T0SE selects the rising edge. Restrictions on the external clock input are discussed in detail in Section 5.2 if extract mcu pic16c505 code.
The prescaler is mutually exclusively shared between the Timer0 module and the Watchdog Timer. The prescaler is not readable or writable. Section 5.3 details the operation of the prescaler.
