PIC18F23K22-ESLASHML datasheet(239/496 Pages) MICROCHIP

239 / 496 page

 2010 Microchip Technology Inc.

Preliminary

DS41412C-page 239

PIC18(L)F2X/4XK22

15.6.2

CLOCK ARBITRATION

Clock arbitration occurs when the master, during any

receive, transmit or Repeated Start/Stop condition,

releases the SCLx pin (SCLx allowed to float high).

When the SCLx pin is allowed to float high, the Baud

Rate Generator (BRG) is suspended from counting

until the SCLx pin is actually sampled high. When the

SCLx pin is sampled high, the Baud Rate Generator is

reloaded with the contents of SSPxADD<7:0> and

begins counting. This ensures that the SCLx 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 15-25).

FIGURE 15-25:

BAUD RATE GENERATOR TIMING WITH CLOCK ARBITRATION

15.6.3

WCOL STATUS FLAG

If the user writes the SSPxBUF when a Start, Restart,

Stop, Receive or Transmit sequence is in progress, the

WCOL is set and the contents of the buffer are

unchanged (the write does not occur). Any time the

WCOL bit is set it indicates that an action on SSPxBUF

was attempted while the module was not Idle.

SDAx

SCLx

SCLx deasserted but slave holds

DX ‚

– 1

BRG

SCLx is sampled high, reload takes

place and BRG starts its count

03h

02h

01h

00h (hold off)

03h

02h

Reload

BRG

Value

SCLx low (clock arbitration)

SCLx allowed to transition high

BRG decrements on

Q2 and Q4 cycles

Note:

Because queueing of events is not

allowed, writing to the lower 5 bits of

SSPxCON2 is disabled until the Start

condition is complete.

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