PIC18F452-I/ML【PDF 111/134 页】IC MCU FLASH 16KX16 A/D 44QFN

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Sheet目录3813

107页 108页 109页 110页 [111页]112页 113页 114页 115页

PIC16C9XX

DS30444E - page 78

1997 Microchip Technology Inc.

FIGURE 11-21: OPERATION OF THE I2C MODULE IN IDLE_MODE, RCV_MODE OR XMIT_MODE

IDLE_MODE (7-bit):

if (Addr_match)

{

Set interrupt;

if (R/W = 1)

{

Send ACK = 0;

set XMIT_MODE;

}

else if (R/W = 0) set RCV_MODE;

}

RCV_MODE:

if ((SSPBUF=Full) OR (SSPOV = 1))

{

Set SSPOV;

Do not acknowledge;

}

else

{

transfer SSPSR

→ SSPBUF;

send ACK = 0;

}

Receive 8-bits in SSPSR;

Set interrupt;

XMIT_MODE:

While ((SSPBUF = Empty) AND (CKP=0)) Hold SCL Low;

Send byte;

Set interrupt;

if ( ACK Received = 1)

{

End of transmission;

Go back to IDLE_MODE;

}

else if ( ACK Received = 0) Go back to XMIT_MODE;

IDLE_MODE (10-Bit):

If (High_byte_addr_match AND (R/W = 0))

{

PRIOR_ADDR_MATCH = FALSE;

Set interrupt;

if ((SSPBUF = Full) OR ((SSPOV = 1))

{

Set SSPOV;

Do not acknowledge;

}

else

{

Set UA = 1;

Send ACK = 0;

While (SSPADD not updated) Hold SCL low;

Clear UA = 0;

Receive Low_addr_byte;

Set interrupt;

Set UA = 1;

If (Low_byte_addr_match)

{

PRIOR_ADDR_MATCH = TRUE;

Send ACK = 0;

while (SSPADD not updated) Hold SCL low;

Clear UA = 0;

Set RCV_MODE;

}

else if (High_byte_addr_match AND (R/W = 1)

{

if (PRIOR_ADDR_MATCH)

{

send ACK = 0;

set XMIT_MODE;

}

else PRIOR_ADDR_MATCH = FALSE;

}

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