PIC18F24J11 MICROCHIP [Microchip Technology], PIC18F24J11 Datasheet - Page 311
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PIC18F24J11
Manufacturer Part Number
PIC18F24J11
Description
28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24J11.pdf
(536 pages)
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FIGURE 19-18:
19.5.6.1
The master device generates all of the serial clock
pulses and the Start and Stop conditions. A transfer is
ended with a Stop condition or with a Repeated Start
condition. Since the Repeated Start condition is also
the beginning of the next serial transfer, the I
not be released.
In Master Transmitter mode, serial data is output
through SDAx while SCLx outputs the serial clock. The
first byte transmitted contains the slave address of the
receiving device (7 bits) and the Read/Write (R/W) bit.
In this case, the R/W bit will be logic ‘0’. Serial data is
transmitted 8 bits at a time. After each byte is transmit-
ted, an Acknowledge bit is received. S and P conditions
are output to indicate the beginning and the end of a
serial transfer.
2011 Microchip Technology Inc.
Note:
SDAx
SCLx
The MSSP module, when configured in
I
of events. For instance, the user is not
allowed to initiate a Start condition and
immediately write the SSPxBUF register
to initiate transmission before the Start
condition is complete. In this case, the
SSPxBUF will not be written to and the
WCOL bit will be set, indicating that a write
to the SSPxBUF did not occur.
2
C Master mode, does not allow queueing
I
2
C Master Mode Operation
MSSPx BLOCK DIAGRAM (I
SDAx In
Bus Collision
SCLx In
Read
2
MSb
C bus will
Write Collision Detect
End of XMIT/RCV
Start bit, Stop bit,
State Counter for
Clock Arbitration
Acknowledge
Stop bit Detect
Start bit Detect
SSPxBUF
SSPxSR
Generate
2
C™ MASTER MODE)
LSb
PIC18F46J11 FAMILY
Write
The following events will cause the MSSP Interrupt
Flag bit, SSPxIF, to be set (and MSSP interrupt, if
enabled):
• Start condition
• Stop condition
• Data transfer byte transmitted/received
• Acknowledge transmitted
• Repeated Start
In Master Receive mode, the first byte transmitted
contains the slave address of the transmitting device
(7 bits) and the R/W bit. In this case, the R/W bit will be
logic ‘1’. Thus, the first byte transmitted is a 7-bit slave
address, followed by a ‘1’ to indicate the receive bit.
Serial data is received via SDAx, while SCLx outputs
the serial clock. Serial data is received 8 bits at a time.
After each byte is received, an Acknowledge bit is
transmitted. S and P conditions indicate the beginning
and end of transmission.
The BRG, used for the SPI mode operation, is used to
set the SCLx clock frequency for either 100 kHz,
400 kHz or 1 MHz I
“Baud Rate”
Clock
Data Bus
Shift
Internal
Set/Reset S, P (SSPxSTAT), WCOL (SSPxCON1)
Set SSPxIF, BCLxIF
Reset ACKSTAT, PEN (SSPxCON2)
for more details.
2
C operation. See
SSPxADD<6:0>
SSPM<3:0>
Generator
Baud
Rate
DS39932D-page 311
Section 19.5.7
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