PIC16F1938 Datasheet, PDF (238/452 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers

PIC16(L)F1938/9
The I²C interface supports the following modes and
features:
• Master mode
• Slave mode
• Byte NACKing (Slave mode)
• Limited Multi-master support
• 7-bit and 10-bit addressing
• Start and Stop interrupts
• Interrupt masking
• Clock stretching
• Bus collision detection
• General call address matching
• Address masking
• Address Hold and Data Hold modes
• Selectable SDA hold times
Figure 24-2 is a block diagram of the I²C interface
module in Master mode. Figure 24-3 is a diagram of the
I²C interface module in Slave mode.
FIGURE 24-2:
MSSP BLOCK DIAGRAM (I²C™ MASTER MODE)
SDA
SCL
SDA in
Read
Internal
data bus
Write
SSPBUF
SSPSR
MSb
Shift
Clock
LSb
Start bit, Stop bit,
Acknowledge
Generate (SSPCON2)
[SSPM 3:0]
Baud Rate
Generator
(SSPADD)
SCL in
Bus Collision
Start bit detect,
Stop bit detect
Write collision detect
Clock arbitration
State counter for
end of XMIT/RCV
Address Match detect
Set/Reset: S, P, SSPSTAT, WCOL, SSPOV
Reset SEN, PEN (SSPCON2)
Set SSPIF, BCLIF
D41574A-page 238
Preliminary
 2011 Microchip Technology Inc.