PIC16F72-E Datasheet, PDF (52/136 Pages) Microchip Technology – 28-Pin, 8-Bit CMOS FLASH Microcontoller with A/D Converter

PIC16F72
FIGURE 9-6:
I²C WAVEFORMS FOR RECEPTION (7-BIT ADDRESS)
SDA
Receiving Address R/W = 0
ACK
Receiving Data
ACK
Receiving Data
ACK
A7 A6 A5 A4 A3 A2 A1
D7 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 (PIR1<3>)
BF (SSPSTAT<0>)
Cleared in software
SSPBUF register is read
Bus Master
terminates
transfer
SSPOV (SSPCON<6>)
Bit SSPOV is set because the SSPBUF register is still full.
ACK is not sent.
FIGURE 9-7:
I²C WAVEFORMS FOR TRANSMISSION (7-BIT ADDRESS)
SDA
Receiving Address
R/W = 1
A7 A6 A5 A4 A3 A2 A1
ACK
Transmitting Data ACK
D7 D6 D5 D4 D3 D2 D1 D0
SCL
S
1 23456789
1 2 34 56 789
Data is
SCL held low
P
sampled
while CPU
responds to SSPIF
SSPIF (PIR1<3>)
Cleared in software
BF (SSPSTAT<0>)
From SSP Interrupt
SSPBUF is written in software Service Routine
CKP (SSPCON<4>)
Set bit after writing to SSPBUF
(the SSPBUF must be written to
before the CKP bit can be set)
DS39597C-page 50
© 2007 Microchip Technology Inc.