PIC18F4410 MICROCHIP [Microchip Technology], PIC18F4410 Datasheet - Page 177
PIC18F4410
Manufacturer Part Number
PIC18F4410
Description
28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F4410.pdf
(378 pages)
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16.4.6
Master mode is enabled by setting and clearing the
appropriate SSPM bits in SSPCON1 and by setting the
SSPEN bit. In Master mode, the SCL and SDA lines
are manipulated by the MSSP hardware.
Master mode of operation is supported by interrupt
generation on the detection of the Start and Stop
conditions. The Stop (P) and Start (S) bits are cleared
from a Reset or when the MSSP module is disabled.
Control of the I
set, or the bus is Idle, with both the S and P bits clear.
In Firmware Controlled Master mode, user code
conducts all I
Stop bit conditions.
Once Master mode is enabled, the user has six
options.
1.
2.
3.
4.
5.
6.
FIGURE 16-16:
© 2007 Microchip Technology Inc.
Assert a Start condition on SDA and SCL.
Assert a Repeated Start condition on SDA and
SCL.
Write
transmission of data/address.
Configure the I
Generate an Acknowledge condition at the end
of a received byte of data.
Generate a Stop condition on SDA and SCL.
SDA
SCL
MASTER MODE
to
2
C bus operations based on Start and
2
C bus may be taken when the P bit is
the
2
C port to receive data.
SSPBUF
MSSP BLOCK DIAGRAM (I
SDA In
register
Bus Collision
SCL In
initiating
Read
MSb
Write Collision Detect
Start bit, Stop bit,
Preliminary
end of XMIT/RCV
State Counter for
Clock Arbitration
Acknowledge
Start bit Detect
Stop bit Detect
SSPBUF
Generate
2
SSPSR
C™ MASTER MODE)
The following events will cause the SSP Interrupt Flag
bit, SSPIF, to be set (SSP interrupt, if enabled):
• Start condition
• Stop condition
• Data transfer byte transmitted/received
• Acknowledge transmit
• Repeated Start
LSb
Note:
Write
Clock
Data Bus
Shift
Internal
PIC18F2X1X/4X1X
Set/Reset, S, P, WCOL (SSPSTAT)
Set SSPIF, BCLIF
Reset ACKSTAT, PEN (SSPCON2)
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 SSPBUF register to
initiate transmission before the Start condi-
tion is complete. In this case, the SSPBUF
will not be written to and the WCOL bit will
be set, indicating that a write to the
SSPBUF did not occur.
2
C Master mode, does not allow queueing
SSPADD<6:0>
SSPM3:SSPM0
Generator
DS39636C-page 175
Baud
Rate
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