I2C Slave mode with START, STOP Interrupt enable

[mbyes]

The Microchip PIC16F87XA has got a MSSP module. Bits SSPM(3 downto 0) in
SSPCON register configure the mode of the module. For I2C operation the
following options are available:

1111 = I2C slave, 10bit addressing, with START/STOP interrupts
1110 = I2C slave, 7bit addressing, with START/STOP interrupts
1011 = I2C firmware controlled master mode (Slave idle)
1000 = I2C master mode
0111 = I2C slave, 10bit addressing
0110 = I2C slave, 7bit addressing

I am troubled, whith the "I2C Slave mode, 7-bit address with START and
STOP bit interrupts enabled".
What does this mode do?

Where can I find some helpful documentation about it?
And show me the "I2C SLAVE MODE TIMING (TRANSMISSION, 7-BIT ADDRESS
with START and STOP bit interrupts enabled)"

How to use I2C Start, Stop Interrupt mode?

pls help me.

thank you.

[Ttelmah]

The option is whether an interrupt is generated only for the 'data' transaction, or for the two control transactions as well (start/stop).
The latter is useful, if the slave needs to initialise something, when the transaction starts.
Look at the Microchip application notes, which give a lot about using the I2C peripheral, and the Phillips data about the I2C protocol itself.

Best Wishes

[mbyes]

#include <18F452.h>
#fuses H4,NOWDT,NOPROTECT,NOLVP,NOPUT,NOBROWNOUT // High Speed Clock for PLL, No Watch Dog Timer, No Code Protection, No Low Voltage P?, No Power Up Timer
#use delay(clock=40000000)
#use RS232(baud=57600,parity=N,xmit=PIN_C6,rcv=PIN_C7)
#use i2c(slave,sda=PIN_C4,scl=PIN_C3, address=0x30, FORCE_HW)

#byte SSPSTAT = 0xFC7
#bit SMP = SSPSTAT.7
#bit CKE = SSPSTAT.6
#bit D_A = SSPSTAT.5
#bit P = SSPSTAT.4
#bit S = SSPSTAT.3
#bit R_W = SSPSTAT.2
#bit UA = SSPSTAT.1
#bit BF = SSPSTAT.0

#byte SSPCON1 = 0xFC6

#byte PIR1 = 0xF9E
#bit SSPIF = PIR1.3

#priority ext, ssp

BYTE buffer[1490];
BYTE Clkcnt = 0;
BYTE datas;
BYTE I2C_Parsing_Data = 0;
int16 i = 0;

#zero_ram

#int_rda
rda_isr(){
int16 j = 0;

datas = getc();
if (datas == 0xFF){
putc(0xAA);
i = 0;
return;
}
else if(datas == 0xF0)
putc(SSPSTAT);

else if(datas == 0xFA)
{
for(j=0; j<i; j++)
putc(buffer[j]);
for(j=0; j<i; j++)
buffer[j] = 0x00;
Clkcnt = 0;
i = 0;
}

else if(datas == 0xAA)
for(j=0; j<i>= 1489) break;
buffer[i++] = I2C_Parsing_Data;
break;
}
case 9:
{
Clkcnt = 0;
break;
}

default : break;
}
I2C_Parsing_Data <<= 1;
}


#INT_SSP
void ssp_isr(){

SSPIF = 0;

if(S){ // Checking to the Start Condition or Restart Condition
Clkcnt = 0;
return;
}
}

void main(){
SSPCON1 = 0x3E;

enable_interrupts(INT_RDA);

set_tris_b(0xff);
port_b_pullups(true);
ext_int_edge(0,L_TO_H);
enable_interrupts(INT_EXT);

enable_interrupts(INT_SSP);

enable_interrupts(global);
while(1){
}
}