PIC18CXX2_13 Datasheet, PDF (130/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
FIGURE 14-8:
I²C SLAVE MODE WAVEFORMS FOR RECEPTION (7-BIT ADDRESS)
SDA
Receiving Address R/W=0
Receiving Data
ACK
Receiving Data
Not ACK
A7 A6 A5 A4 A3 A2 A1
ACKD7 _{D6 D5 D4 D3 D2 D1 D0}
D7 D6 D5 D4 D3 D2 D1 D0
SCL S 1 2 3 4 5 6 7 8 9 ^{1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9}
P
SSPIF
BF (SSPSTAT<0>)
SSPOV (SSPCON1<6>)
Cleared in software
SSPBUF register is read
Bit SSPOV is set because the SSPBUF register is still full.
ACK is not sent.
Bus Master
terminates
transfer
FIGURE 14-9:
SDA
A7
I²C SLAVE MODE WAVEFORMS FOR TRANSMISSION (7-BIT ADDRESS)
Receiving Address
R/W = 1
A6 A5 A4 A3 A2 A1
ACK
R/W = 0
Transmitting Data Not ACK
D7 D6 D5 D4 D3 D2 D1 D0
SCL
S
1 23456789
1 2 34 56 789
Data in
SCL held low
P
sampled
while CPU
responds to SSPIF
SSPIF
BF (SSPSTAT<0>)
Cleared in software
From SSP Interrupt
SSPBUF is written in software Service Routine
CKP (SSPCON1<4>)
Set bit after writing to SSPBUF
(the SSPBUF must be written to
before the CKP bit can be set)
DS39026D-page 130
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