To PIC18F27J13 MCU Memory Copying during Sleep, all the following conditions must be met before entering Sleep mode:

• RCSTA and TXSTA Control registers must be configured for Synchronous Slave Reception.
• If interrupts are desired, set the RCIE bit of the PIE1 register and the GIE and PEIE bits of the INTCON register to Extract IC AT89C51RB2 Code.
• The RCIF interrupt flag must be cleared by read- ing RCREG to unload any pending characters in the receive buffer.

Upon entering Sleep mode, the device will be ready to accept data and clocks on the RX/DT and TX/CK pins, respectively. When the data word has been completely clocked in by the external device through Read MCU AT89C51RC2 Binary, the RCIF interrupt flag bit of the PIR1 register will be set. Thereby, waking the processor from Sleep.

Upon waking from Sleep, the instruction following the SLEEP instruction will be executed. If the Global Inter- rupt Enable (GIE) bit of the INTCON register is also set in order to MCU Extract Microprobing, then the Interrupt Service Routine at address 004h will be called.

To transmit during Sleep, all the following conditions must be met before entering Sleep mode:

• RCSTA and TXSTA Control registers must be configured for Synchronous Slave Transmission.
• The TXIF interrupt flag must be cleared by writing the output data to the TXREG, thereby filling the TSR and transmit buffer.
• If interrupts are desired, set the TXIE bit of the PIE1 register and the PEIE bit of the INTCON register.
• Interrupt enable bits TXIE of the PIE1 register and PEIE of the INTCON register must set.

Upon entering Sleep mode in the process of Copy PIC18F27J13 MCU Memory, the device will be ready to accept clocks on TX/CK pin and transmit data on the RX/DT pin. When the data word in the TSR has been completely clocked out by the external device from Extract MCU Protect Mechanism, the pending byte in the TXREG will transfer to the TSR and the TXIF flag will be set. Thereby, waking the processor from Sleep. At this point, the TXREG is available to accept another character for transmission, which will clear the TXIF flag.

Upon waking from Sleep, the instruction following the SLEEP instruction will be executed by Reverse Engineering Microcontroller. If the Global Interrupt Enable (GIE) bit is also set then the Interrupt Service Routine at address 0004h will be called.