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We can extract embedded firmware of Secured MCU PIC16LF874, please view the Secured MCU PIC16LF874 features for your reference:
An SSP interrupt is generated for each data transferbyte. Flag bit SSPIF must be cleared in software, and the SSPSTAT register is used to determine the status of the byte. Flag bit SSPIF is set on the falling edge of the ninth clock pulse.
As a slave-transmitter, the ACK pulse from the master receiver is latched on the rising edge of the ninth SCL input pulse. If the SDA line was high (not ACK), then the data transfer is complete. When the ACK is latched by the slave, the slave logic is reset (resets SSPSTAT register) and the slave then monitors for another occurrence of the Start bit.
If the SDA line was low (ACK), the transmit data must be loaded into the SSPBUF register, which also loads the SSPSR register. Then pin RC6/TX/CK/SCK/SCL/SEG9 should be enabled by setting bit CKP before Secured MCU PIC16LF874 Embedded Firmware Decoding.
Master mode of operation is supported in firmware using interrupt generation on the detection of the Start and Stop conditions. The Stop (P) and Start (S) bits are cleared from a Reset or when the SSP module is disabled. The Stop (P) and Start (S) bits will toggle based on the Start and Stop conditions. Control of the I2C bus may be taken when the P bit is set or the bus is idle and both the S and P bits are clear.
In Master mode, the SCL and SDA lines are manipulated by clearing the corresponding TRISC<6:7> bit(s). The output level is always low, irrespective of the value(s) in PORTC<6:7>. So when transmitting data, a ‘1’ data bit must have the TRISC<7> bit set (input) and a ‘0’ data bit must have the TRISC<7> bit cleared (output).
The same scenario is true for the SCL line with the TRISC<6> bit. Pull-up resistors must be provided externally to the SCL and SDA pins for proper operation of the I2C module after Secured MCU PIC16LF874 Embedded Firmware Decoding.
The following events will cause the SSP Interrupt Flag bit, SSPIF, to be set (SSP Interrupt will occur if enabled):
Start condition
Stop condition
Data transfer byte transmitted/received
Master mode of operation can be done with either the Slave mode idle (SSPM<3:0> = 1011), or with the Slave active. When both Master and Slave modes are enabled, the software needs to differentiate the source(s) of the interrupt when CRACK MCU.