Information

© 2008 Microchip Technology Inc. DS39646C-page 227
PIC18F8722 FAMILY
FIGURE 19-13: I
2
C™ SLAVE MODE TIMING WITH SEN = 1 (RECEPTION, 7-BIT ADDRESS)
SDAx SCLx SSPxIF (PIR1<3> or PIR3<7>) BF (SSPxSTAT<0>)
SSPOV (SSPxCON1<6>)
S
1 234 56789 1 2345 6789 1 2345 7 89
P
A7 A6 A5 A4 A3 A2 A1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D1 D0
ACK
Receiving Data
ACK
Receiving Data
R/W
= 0
ACK
Receiving Address
Cleared in software
SSPxBUF is read
Bus master terminates transfer
SSPOV is set because SSPxBUF is still full. ACK is not sent.
D2
6
CKP
CKP written to ‘1’ in
If BF is cleared prior to the falling edge of the 9th clock, CKP will not be reset to ‘0’ and no clock stretching will occur
software
Clock is held low until CKP is set to ‘1’
Clock is not held low because buffer full bit is clear prior to falling edge of 9th clock
Clock is not held low because ACK = 1
BF is set after falling edge of the 9th clock, CKP is reset to ‘
0’ and
clock stretching occurs