Datasheet

PIC18F6390/6490/8390/8490
DS39629C-page 188 © 2007 Microchip Technology Inc.
FIGURE 15-21: I
2
C™ MASTER MODE WAVEFORM (TRANSMISSION, 7 OR 10-BIT ADDRESS)
SDA SCL SSPIF BF (SSPSTAT<0>) SEN
A7 A6 A5 A4 A3 A2 A1 ACK
= 0 D7 D6 D5 D4 D3 D2 D1 D0
ACK
Transmitting Data or Second Half
R/W
= 0Transmit Address to Slave
123456789 12 3456789
P
Cleared in software service routine
SSPBUF is written in software
from MSSP interrupt
After Start condition, SEN cleared by hardware
S
SSPBUF written with 7-bit address and R/W
start transmit
SCL held low
while CPU
responds to SSPIF
SEN = 0
of 10-bit Address
Write SSPCON2<0> SEN = 1 Start condition begins
From slave, clear ACKSTAT bit SSPCON2<6>
ACKSTAT in SSPCON2 = 1
Cleared in software
SSPBUF written
PEN
R/W
Cleared in software