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PIC18F23K20-E/ML データシート(PDF) 215 Page - Microchip Technology

部品番号 PIC18F23K20-E/ML
部品情報  28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
PDF  456 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F23K20-E/ML データシート(HTML) 215 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS41303G-page 215
PIC18F2XK20/4XK20
17.4.4.5
Clock Synchronization and
the CKP bit
When the CKP bit is cleared, the SCL output is forced
to ‘0’. However, clearing the CKP bit will not assert the
SCL output low until the SCL output is already sam-
pled low. Therefore, 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 deasserted SCL. This
ensures that a write to the CKP bit will not violate the
minimum
high
time
requirement
for
SCL
(see
Figure 17-12).
FIGURE 17-12:
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
SSPCON1
CKP
Master device
deasserts clock
Master device
asserts clock



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