PIC16F872SLASHSP datasheet(75/160 Pages) MICROCHIP

75 / 160 page

Preliminary

DS30221A-page 75

PIC16F872

9.2.13

ACKNOWLEDGE SEQUENCE TIMING

An acknowledge sequence is enabled by setting the

acknowledge

sequence

enable

bit,

ACKEN

(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, the ACKDT bit should be

cleared.

If not, the user should set the ACKDT bit

before starting an acknowledge sequence. The baud

rate generator then counts for one rollover period

(TBRG), and the SCL pin is deasserted (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 ACKEN bit is auto-

matically cleared, the baud rate generator is turned off,

and the SSP module then goes into IDLE mode.

(Figure 9-16)

9.2.13.13 WCOL STATUS FLAG

If the user writes the SSPBUF when an acknowledege

sequence is in progress, the WCOL is set and the con-

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

occur).

FIGURE 9-16: ACKNOWLEDGE SEQUENCE WAVEFORM

Note: TBRG = one baud rate generator period.

SDA

SCL

Set SSPIF at the end

Acknowledge sequence starts here,

Write to SSPCON2

ACKEN automatically cleared

Cleared in

TBRG

of receive

ACK

ACKEN = 1, ACKDT = 0

SSPIF

software

Set SSPIF at the end

of acknowledge sequence

Cleared in

software

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