參數(shù)資料
型號: 16F872
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
中文描述: 28引腳,8位閃存微控制器的CMOS
文件頁數(shù): 75/160頁
文件大?。?/td> 2600K
代理商: 16F872
1999 Microchip Technology Inc.
Preliminary
DS30221A-page 75
PIC16F872
9.2.13
ACKNOWLEDGE SEQUENCE TIMING
An acknowledge sequence is enabled by setting the
acknowledge
sequence
(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
BRG
), and the SCL pin is deasserted (pulled high).
When the SCL pin is sampled high (clock arbitration),
enable
bit,
ACKEN
the baud rate generator counts for T
BRG
. 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:
T
BRG
= one baud rate generator period.
SDA
SCL
Set SSPIF at the end
of receive
Acknowledge sequence starts here,
Write to SSPCON2
ACKEN = 1, ACKDT = 0
ACKEN automatically cleared
Cleared in
software
T
BRG
T
BRG
ACK
8
D0
9
SSPIF
Set SSPIF at the end
of acknowledge sequence
Cleared in
software
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