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PIC18F4539-E/MLSQTP Datasheet(PDF) 147 Page - Microchip Technology

Part # PIC18F4539-E/MLSQTP
Description  Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel
PDF  322 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4539-E/MLSQTP Datasheet(HTML) 147 Page - Microchip Technology

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 2002 Microchip Technology Inc.
Preliminary
DS30485A-page 145
PIC18FXX39
16.4.4.5
Clock Synchronization and
the CKP bit
If a user clears the CKP bit, the SCL output is forced to
‘0’. Setting the CKP bit will not assert the SCL output
low until the SCL output is already sampled low. If the
user attempts to drive SCL low, the CKP bit will not
assert the SCL line until an external I2C master device
has already asserted the SCL line. The SCL output will
remain low until the CKP bit is set, and all other
devices on the I2C bus have de-asserted SCL. This
ensures that a write to the CKP bit will not violate the
minimum high time requirement for SCL (see
Figure 16-12).
FIGURE 16-12:
CLOCK SYNCHRONIZATION TIMING
SDA
SCL
DX-1
DX
WR
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
SSPCON
CKP
Master device
de-asserts clock
Master device
asserts clock



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