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PIC17C752-08/P Datasheet(PDF) 159 Page - Microchip Technology

Part # PIC17C752-08/P
Description  High-Performance 8-Bit CMOS EPROM Microcontrollers
PDF  320 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC17C752-08/P Datasheet(HTML) 159 Page - Microchip Technology

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© 1997 Microchip Technology Inc.
Preliminary
DS30264A-page 159
PIC17C75X
15.2.13 CLOCK ARBITRATION
Clock arbitration occurs when the master during any
receive, transmit, or restart/stop condition de-asserts
the SCL pin (SCL allowed to float high).
When the
SCL pin is allowed to float high, the baud rate genera-
tor (BRG) is suspended from counting until the SCL
pin is actually sampled high. When the SCL pin is
sampled high, the baud rate generator is reloaded with
the contents of SSPADD<6:0> and begins counting.
This ensures that the SCL high time will always be at
least one BRG rollover count in the event that the
clock is held low by an external device. (Figure 15-36)
FIGURE 15-36: CLOCK ARBITRATION TIMING IN MASTER TRANSMIT MODE
SCL
SDA
BRG overflow,
Release SCL,
If SCL = 1 Load BRG with
SSPADD<6:0>, and start count
BRG overflow occurs,
Release SCL, Slave device holds SCL low.
SCL = 1 BRG starts counting
clock high interval.
SCL line sampled once every machine cycle (Tosc • 4).
Hold off BRG until SCL is sampled high.
T
BRG
T
BRG
T
BRG
to measure high time interval



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