PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 155

• Manufacturer Part Number: PIC17C752
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

15.2.11 ACKNOWLEDGE SEQUENCE TIMING
An acknowledge sequence is enabled by setting the
acknowledge
(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 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
(T
When the SCL pin is sampled high (clock arbitration),
the baud rate generator counts for T
pin is then pulled low for one T
the ACKEN bit is automatically cleared, the baud rate
generator is turned off, and the SSP module then goes
into IDLE mode. (Figure 15-32)
FIGURE 15-32: ACKNOWLEDGE SEQUENCE TIMING
BRG
1997 Microchip Technology Inc.
), and the SCL pin is de-asserted (pulled high).
Note: T
BRG
sequence
SSPIF
= one baud rate generator period.
Acknowledge sequence starts here
SDA
SCL
Set SSPIF at the end
of receive
ACKEN = 1, ACKDT = 0
enable
Write to SSPCON2
BRG
. Following this,
BRG
8
D0
bit,
. The SCL
ACKEN
Cleared in
software
T
Preliminary
BRG
ACK
T
9
BRG
Set SSPIF at the end
of acknowledge sequence
15.2.11.1 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).
ACKEN automatically cleared
Cleared in
software
DS30264A-page 155