16F876 Microchip Technology, 16F876 Datasheet - Page 85

• Manufacturer Part Number: 16F876
• Description: 28/40-pin 8-Bit CMOS FLASH Microcontrollers
• Manufacturer: Microchip Technology

9.2.13
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, 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),
FIGURE 9-16: ACKNOWLEDGE SEQUENCE WAVEFORM
BRG
1999 Microchip Technology Inc.
), and the SCL pin is deasserted (pulled high).
ACKNOWLEDGE SEQUENCE TIMING
SSPIF
Note: T
sequence
Acknowledge sequence starts here,
SDA
SCL
Set SSPIF at the end
of receive
BRG
= one baud rate generator period.
ACKEN = 1, ACKDT = 0
enable
Write to SSPCON2
bit,
8
D0
ACKEN
Cleared in
software
T
BRG
ACK
the baud rate generator counts for T
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
9.2.13.1
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).
T
BRG
9
Set SSPIF at the end
of acknowledge sequence
9-16)
WCOL STATUS FLAG
ACKEN automatically cleared
Cleared in
software
PIC16F87X
BRG
DS30292A-page 85
. The SCL pin