Datasheet

 2007-2013 Microchip Technology Inc. DS80000302H-page 9
PIC16F88X
FIGURE 3: ACTUAL (INCORRECT) OPERATION WITH CLOCK STRETCHING – EXAMPLE 1
FIGURE 4: ACTUAL (INCORRECT) OPERATION WITH CLOCK STRETCHING – EXAMPLE 2
Work around
Set the communication speed to match the
slowest device on the bus. This ensures that no
slave device will perform clock stretching.
It is possible to dynamically adjust the
communication speed to match the device being
addressed by modifying the BRG register.
However, the behavior of slower slave devices
must be understood and speed adjustments made
such that no slave performs clock stretching.
Affected Silicon Revisions
PIC16F882
PIC16F883/PIC16F884
PIC16F886/PIC16F887
SDA
SCL
Maste
r
Slave
BRG Period
BRG Period
BRG Period
BRG Period BRG Period
BRG Period
SDA
SCL
Master
Slave
BRG Period
BRG Period
BRG Period
BRG Period BRG Period
BRG Period
A0
X
A0
X
A2
X