FIGURE 11-21: OPERATION OF THE I2
參數(shù)資料
型號(hào): KSZ8864RMNI
廠商: Micrel Inc
文件頁(yè)數(shù): 88/111頁(yè)
文件大小: 0K
描述: IC ETHERNET SWITCH 4PORT 64QFN
特色產(chǎn)品: KSZ8864RMN Ethernet Switches
標(biāo)準(zhǔn)包裝: 348
系列: *
其它名稱: 576-3995
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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