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): 76/160頁
文件大?。?/td> 2600K
代理商: 16F872
PIC16F872
DS30221A-page 76
Preliminary
1999 Microchip Technology Inc.
9.2.14
STOP CONDITION TIMING
A stop bit is asserted on the SDA pin at the end of a
receive/transmit by setting the Stop Sequence Enable
bit PEN (SSPCON2<2>). At the end of a receive/trans-
mit, the SCL line is held low after the falling edge of the
ninth clock. When the PEN bit is set, the master will
assert the SDA line low . When the SDA line is sam-
pled low, the baud rate generator is reloaded and
counts down to 0. When the baud rate generator times
out, the SCL pin will be brought high, and one T
BRG
(baud rate generator rollover count) later, the SDA pin
will be deasserted. When the SDA pin is sampled high
while SCL is high, the P bit (SSPSTAT<4>) is set. A
T
BRG
later, the PEN bit is cleared and the SSPIF bit is
set (
Figure 9-17
).
Whenever the firmware decides to take control of the
bus, it will first determine if the bus is busy by checking
the S and P bits in the SSPSTAT register. If the bus is
busy, then the CPU can be interrupted (notified) when
a Stop bit is detected (i.e., bus is free).
9.2.14.14 WCOL STATUS FLAG
If the user writes the SSPBUF when a STOP sequence
is in progress, then WCOL is set and the contents of the
buffer are unchanged (the write doesn’t occur).
FIGURE 9-17: STOP CONDITION RECEIVE OR TRANSMIT MODE
SCL
SDA
SDA asserted low before rising edge of clock
to setup stop condition.
Write to SSPCON2
Set PEN
Falling edge of
9th clock
SCL = 1 for T
BRG
, followed by SDA = 1 for T
BRG
after SDA sampled high. P bit (SSPSTAT<4>) is set
SCL brought high after T
BRG
Note:
T
BRG
= one baud rate generator period.
T
BRG
T
BRG
T
BRG
ACK
P
T
BRG
PEN bit (SSPCON2<2>) is cleared by
hardware and the SSPIF bit is set
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