Datasheet

 2010-2012 Microchip Technology Inc. DS41412F-page 231
PIC18(L)F2X/4XK22
FIGURE 15-17: I
2
C SLAVE, 7-BIT ADDRESS, RECEPTION (SEN = 1, AHEN = 1, DHEN = 1)
Receiving Address Receive Data Receive Data
A7 A6 A5 A4 A3 A2 A1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
SDAx
SCLx
SSPxIF
BF
ACKDT
CKP
S P
ACK
S
12
34
5678
9
12
3
45678 9
12
34567 8
9
ACK
ACK
Cleared by software
ACKTIM is cleared by hardware
SSPxBUF can be
Set by software,
read any time before next byte is loaded
release SCLx
on 9th rising edge of SCLx
Received
address is loaded into SSPxBUF
Slave software clears ACKDT to ACK
R/W = 0
Master releases
SDAx to slave for ACK
sequence
the received byte
When AHEN = 1; on the 8th falling edge of SCLx of an address byte, CKP is cleared
ACKTIM is set by hardware
on 8th falling edge of SCLx
When DHEN = 1;
on the 8th falling edge of SCLx of a received data byte, CKP is cleared
Received data is available on SSPxBUF
Slave sends not ACK
CKP is not cleared if not ACK
P
Master sends Stop condition
No interrupt after
if not ACK
from Slave
ACKTIM