Datasheet

PIC16(L)F1516/7/8/9
DS41452C-page 228  2010-2012 Microchip Technology Inc.
REGISTER 21-2: SSPCON1: SSP CONTROL REGISTER 1
R/C/HS-0/0 R/C/HS-0/0 R/W-0/0 R/W-0/0 R/W-0/0 R/W-0/0 R/W-0/0 R/W-0/0
WCOL SSPOV SSPEN CKP SSPM<3:0>
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set ‘0’ = Bit is cleared HS = Bit is set by hardware C = User cleared
bit 7
WCOL: Write Collision Detect bit
Master mode:
1 = A write to the SSPBUF register was attempted while the I
2
C conditions were not valid for a transmission to be started
0 = No collision
Slave mode:
1 = The SSPBUF register is written while it is still transmitting the previous word (must be cleared in software)
0 = No collision
bit 6
SSPOV: Receive Overflow Indicator bit
(1)
In SPI mode:
1 = A new byte is received while the SSPBUF register is still holding the previous data. In case of overflow, the data in SSPSR is lost.
Overflow can only occur in Slave mode. In Slave mode, the user must read the SSPBUF, even if only transmitting data, to avoid
setting overflow. In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by writing to the
SSPBUF register (must be cleared in software).
0 = No overflow
In I
2
C mode:
1 = A byte is received while the SSPBUF register is still holding the previous byte. SSPOV is a “don’t care” in Transmit mode
(must be cleared in software).
0 = No overflow
bit 5
SSPEN: Synchronous Serial Port Enable bit
In both modes, when enabled, these pins must be properly configured as input or output
In SPI mode:
1 = Enables serial port and configures SCK, SDO, SDI and SS as the source of the serial port pins
(2)
0 = Disables serial port and configures these pins as I/O port pins
In I
2
C mode:
1 = Enables the serial port and configures the SDA and SCL pins as the source of the serial port pins
(3)
0 = Disables serial port and configures these pins as I/O port pins
bit 4
CKP: Clock Polarity Select bit
In SPI mode:
1 = Idle state for clock is a high level
0 = Idle state for clock is a low level
In I
2
C Slave mode:
SCL release control
1 = Enable clock
0 = Holds clock low (clock stretch). (Used to ensure data setup time.)
In I
2
C Master mode:
Unused in this mode
bit 3-0 SSPM<3:0>: Synchronous Serial Port Mode Select bits
1111 = I
2
C Slave mode, 10-bit address with Start and Stop bit interrupts enabled
1110 = I
2
C Slave mode, 7-bit address with Start and Stop bit interrupts enabled
1101 = Reserved
1100 = Reserved
1011 = I
2
C firmware controlled Master mode (slave idle)
1010 = SPI Master mode, clock = FOSC/(4 * (SSPADD+1))
(5)
1001 = Reserved
1000 = I
2
C Master mode, clock = FOSC / (4 * (SSPADD+1))
(4)
0111 = I
2
C Slave mode, 10-bit address
0110 = I
2
C Slave mode, 7-bit address
0101 = SPI Slave mode, clock = SCK pin, SS pin control disabled, SS can be used as I/O pin
0100 = SPI Slave mode, clock = SCK pin, SS pin control enabled
0011 = SPI Master mode, clock = TMR2 output/2
0010 = SPI Master mode, clock = FOSC/64
0001 = SPI Master mode, clock = FOSC/16
0000 = SPI Master mode, clock = FOSC/4
Note 1: In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by writing to the SSPBUF register.
2: When enabled, these pins must be properly configured as input or output.
3: When enabled, the SDA and SCL pins must be configured as inputs.
4: SSPADD values of 0, 1 or 2 are not supported for I
2
C mode.
5: SSPADD value of ‘0’ is not supported. Use SSPM = 0000 instead.