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We can carry out Locked Microcomputer PIC16F877 Embedded Firmware Cloning, please view the Processor PIC16F877 features for your reference:
In Slave mode, the SCL and SDA pins must be configured as inputs (TRISC<7:6> set). The SSP module will override the input state with the output data when required (slave-transmitter).
When an address is matched, or the data transfer after an address match is received, the hardware automatically will generate the Acknowledge (ACK) pulse, and then load the SSPBUF register with the received value currently in the SSPSR register.
There are certain conditions that will cause the SSP module not to give this ACK pulse. They include (either or both):
a) The buffer full bit BF (SSPSTAT<0>) was set before the transfer was received.
b) The overflow bit SSPOV (SSPCON<6>) was set before the transfer was received.

In this case, the SSPSR register value is not loaded into the SSPBUF, but bit SSPIF (PIR1<3>) is set. Table 14-3 shows the results of when a data transfer byte is received, given the status of bits BF and SSPOV. The shaded cells show the condition where user software did not properly clear the overflow condition if Locked Microcomputer PIC16F877 Embedded Firmware Cloning.
Flag bit BF is cleared by reading the SSPBUF register, while bit SSPOV is cleared through software. The SCL clock input must have a minimum high and low for proper operation. For high and low times of the I2C specification, as well as the requirements of the SSP module, see Section 19.0 “Electrical Specifications”.
Once the SSP module has been enabled, it waits for a Start condition to occur. Following the Start condition, the 8-bits are shifted into the SSPSR register. All incoming bits are sampled with the rising edge of the clock (SCL) line. The value of register SSPSR<7:1> is compared to the value of the SSPADD register before Locked Microcomputer PIC16F877 Embedded Firmware Cloning.
The address is compared on the falling edge of the eighth clock (SCL) pulse. If the addresses match, and the BF and SSPOV bits are clear, the following events occur:
a) The SSPSR register value is loaded into the SSPBUF register. The buffer full bit, BF is set. An ACK pulse is generated. SSP interrupt flag bit, SSPIF (PIR1<3>) is set (interrupt is generated if enabled) on the falling edge of the ninth SCL pulse.
In 10-bit Address mode, two address bytes need to be received by the slave (Figure 14-8). The five Most Significant bits (MSbs) of the first address byte specify if this is a 10-bit address. Bit R/W (SSPSTAT<2>) must specify a write so the slave device will receive the second address byte. For a 10-bit address, the first byte would equal ‘1111 0 A9 A8 0’, where A9 and A8 are the two MSbs of the address when CLONE IC.