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PIC18F44J10-E/ML bảng dữ liệu(PDF) 168 Page - Microchip Technology

tên linh kiện PIC18F44J10-E/ML
Giải thích chi tiết về linh kiện  28/40/44-Pin High-Performance RISC Microcontrollers with nanoWatt Technology
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PIC18F45J10 FAMILY
DS39682C-page 166
Preliminary
© 2007 Microchip Technology Inc.
15.4.4.5
Clock Synchronization and
the CKP bit
When the CKP bit is cleared, the SCLx output is forced
to ‘0’. However, clearing the CKP bit will not assert the
SCLx output low until the SCLx output is already sam-
pled low. Therefore, the CKP bit will not assert the
SCLx line until an external I2C master device has
already asserted the SCLx line. The SCLx output will
remain low until the CKP bit is set and all other
devices on the I2C bus have deasserted SCLx. This
ensures that a write to the CKP bit will not violate the
minimum high time requirement for SCLx (see
Figure 15-12).
FIGURE 15-12:
CLOCK SYNCHRONIZATION TIMING
SDAx
SCLx
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
SSPxCON
CKP
Master device
deasserts clock
Master device
asserts clock



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