PIC16LC774-04SLASHSS datasheet(85/200 Pages) MICROCHIP

85 / 200 page

PIC16C77X

Advance Information

DS30275A-page 85

8.2.13

ACKNOWLEDGE SEQUENCE TIMING

An acknowledge sequence is enabled by setting the

acknowledge

sequence

enable

bit,

AKEN

(SSPCON2<4>). When this bit is set, the SCL pin is

pulled low and the contents of the acknowledge data

bit is presented on the SDA pin. If the user wishes to

generate an acknowledge, then the AKDT bit should be

cleared. If not, the user should set the AKDT bit before

starting an acknowledge sequence.

The baud rate

generator then counts for one rollover period (TBRG),

and the SCL pin is de-asserted (pulled high). When the

SCL pin is sampled high (clock arbitration), the baud

rate generator counts for TBRG . The SCL pin is then

pulled low. Following this, the AKEN bit is automati-

cally cleared, the baud rate generator is turned off, and

the SSP module then goes into IDLE mode. (Figure 8-

29)

8.2.13.13 WCOL STATUS FLAG

If the user writes the SSPBUF when an acknowledege

sequence is in progress, then WCOL is set and the

contents of the buffer are unchanged (the write doesn’t

occur).

FIGURE 8-29: ACKNOWLEDGE SEQUENCE WAVEFORM

Note: T

BRG= one baud rate generator period.

SDA

SCL

Set SSPIF at the end

Acknowledge sequence starts here,

Write to SSPCON2

AKEN automatically cleared

Cleared in

BRG

of receive

ACK

AKEN = 1, AKDT = 0

SSPIF

software

Set SSPIF at the end

of acknowledge sequence

Cleared in

software

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