PIC16F87-ISLASHML datasheet(91/214 Pages) MICROCHIP

91 / 214 page

 2003 Microchip Technology Inc.

Preliminary

DS30487B-page 89

PIC16F87/88

SSPCON: SYNCHRONOUS SERIAL PORT CONTROL REGISTER (ADDRESS 14h)

R/W-0

WCOL

SSPOV

SSPEN(1)

CKP

SSPM3

SSPM2

SSPM1

SSPM0

bit 7

bit 0

bit 7

WCOL: Write Collision Detect bit

= An attempt to write the SSPBUF register failed because the SSP module is busy

(must be cleared in software)

= No collision

bit 6

SSPOV: Receive Overflow Indicator bit

In SPI mode:

= 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. 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.

= No overflow

In I2C mode:

= A byte is received while the SSPBUF register is still holding the previous byte. SSPOV is a

“don’t care” in Transmit mode. SSPOV must be cleared in software in either mode.

= No overflow

bit 5

SSPEN: Synchronous Serial Port Enable bit(1)

In SPI mode:

= Enables serial port and configures SCK, SDO, and SDI as serial port pins

= Disables serial port and configures these pins as I/O port pins

In I2C mode:

= Enables the serial port and configures the SDA and SCL pins as serial port pins

= Disables serial port and configures these pins as I/O port pins

Note 1: In both modes, when enabled, these pins must be properly configured as input or

output.

bit 4

CKP: Clock Polarity Select bit

In SPI mode:

= Transmit happens on falling edge, receive on rising edge. IDLE state for clock is a high level.

= Transmit happens on rising edge, receive on falling edge. IDLE state for clock is a low level.

In I2C Slave mode:

SCK release control

= Enable clock

= Holds clock low (clock stretch). (Used to ensure data setup time.)

bit 3-0

SSPM<3:0>: Synchronous Serial Port Mode Select bits

0000

= SPI Master mode, clock = OSC/4

0001

= SPI Master mode, clock = OSC/16

0010

= SPI Master mode, clock = OSC/64

0011

= SPI Master mode, clock = TMR2 output/2

0100

= SPI Slave mode, clock = SCK pin. SS pin control enabled.

0101

= SPI Slave mode, clock = SCK pin. SS pin control disabled. SS can be used as I/O pin.

0110

= I2C Slave mode, 7-bit address

0111

= I2C Slave mode, 10-bit address

1011

= I2C firmware controlled Master mode (Slave IDLE)

1110

= I2C Slave mode, 7-bit address with START and STOP bit interrupts enabled

1111

= I2C Slave mode, 10-bit address with START and STOP bit interrupts enabled

1000

, 1001, 1010, 1100, 1101 = Reserved

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

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