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鍨嬭櫉锛� PIC16F876-20I/SP
寤犲晢锛� Microchip Technology
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PIC16F87X
DS30292C-page 80
2001 Microchip Technology Inc.
FIGURE 9-11:
BAUD RATE GENERATOR TIMING WITH CLOCK ARBITRATION
9.2.9
I2C MASTER MODE START
CONDITION TIMING
To initiate a START condition, the user sets the START
condition enable bit, SEN (SSPCON2<0>). If the SDA
and SCL pins are sampled high, the baud rate genera-
tor is reloaded with the contents of SSPADD<6:0> and
starts its count. If SCL and SDA are both sampled high
when the baud rate generator times out (TBRG), the
SDA pin is driven low. The action of the SDA being
driven low while SCL is high is the START condition,
and causes the S bit (SSPSTAT<3>) to be set. Follow-
ing this, the baud rate generator is reloaded with the
contents of SSPADD<6:0> and resumes its count.
When the baud rate generator times out (TBRG), the
SEN bit (SSPCON2<0>) will be automatically cleared
by hardware. The baud rate generator is suspended,
leaving the SDA line held low, and the START condition
is complete.
9.2.9.1
WCOL Status Flag
If the user writes the SSPBUF when a START
sequence is in progress, then WCOL is set and the
contents of the buffer are unchanged (the write doesn鈥檛
occur).
FIGURE 9-12:
FIRST START BIT TIMING
SDA
SCL
SCL de-asserted but slave holds
DX-1
DX
BRG
SCL is sampled high, reload takes
place, and BRG starts its count
03h
02h
01h
00h (hold off)
03h
02h
Reload
BRG
Value
SCL low (clock arbitration)
SCL allowed to transition high
BRG decrements
(on Q2 and Q4 cycles)
Note:
If, at the beginning of START condition, the
SDA and SCL pins are already sampled
low, or if during the START condition the
SCL line is sampled low before the SDA
line is driven low, a bus collision occurs,
the Bus Collision Interrupt Flag (BCLIF) is
set, the START condition is aborted, and
the I2C module is reset into its IDLE state.
Note:
Because
queueing
of
events
is
not
allowed, writing to the lower 5 bits of
SSPCON2 is disabled until the START
condition is complete.
SDA
SCL
S
TBRG
1st Bit
2nd Bit
TBRG
SDA = 1,
At completion of START bit,
SCL = 1
Write to SSPBUF occurs here
TBRG
Hardware clears SEN bit
TBRG
Write to SEN bit occurs here
Set S bit (SSPSTAT<3>)
and sets SSPIF bit
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