PIC18F6620 Microchip, PIC18F6620 Datasheet - Page 183

• Manufacturer Part Number: PIC18F6620
• Description: Microcontroller
• Manufacturer: Microchip

17.4.6
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 17-16:
 2004 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
PIC18F6520/8520/6620/8620/6720/8720
2
C port to receive data.
SSPBUF
MSSP BLOCK DIAGRAM (I
SDA In
Bus Collision
SCL In
register
Read
initiating
MSb
Write Collision Detect
Start bit, Stop bit,
end of XMIT/RCV
State Counter for
Clock Arbitration
Start bit Detect
Acknowledge
Stop bit Detect
SSPBUF
Generate
SSPSR
2
C MASTER MODE)
LSb
Write
The following events will cause 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
Clock
Data Bus
Shift
Note:
Internal
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
Baud
Rate
DS39609B-page 181