PIC16F72SLASHML datasheet(46/136 Pages) MICROCHIP

46 / 136 page

PIC16F72

DS39597B-page 44

 2002 Microchip Technology Inc.

SSPSTAT: SYNCHRONOUS SERIAL PORT STATUS REGISTER (ADDRESS 94h)

R/W-0

R-0

SMP

CKE

D/A

R/W

bit 7

bit 0

bit 7

SMP: SPI Data Input Sample Phase bits

SPI Master mode:

= Input data sampled at end of data output time

= Input data sampled at middle of data output time (Microwire®)

SPI Slave mode:

SMP must be cleared when SPI is used in Slave mode

I2C mode:

This bit must be maintained clear

bit 6

CKE: SPI Clock Edge Select bits (Figure 9-2, Figure 9-3, and Figure 9-4)

SPI mode, CKP = 0:

= Data transmitted on rising edge of SCK (Microwire alternate)

= Data transmitted on falling edge of SCK

SPI mode, CKP = 1:

= Data transmitted on falling edge of SCK (Microwire default)

= Data transmitted on rising edge of SCK

I2C mode:

This bit must be maintained clear

bit 5

D/A: Data/Address bit (I2C mode only)

= Indicates that the last byte received or transmitted was data

= Indicates that the last byte received or transmitted was address

bit 4

P: STOP bit (I2C mode only) – This bit is cleared when the SSP module is disabled, or when

the START bit is detected last. SSPEN is cleared.

= Indicates that a STOP bit has been detected last (this bit is ‘0’ on RESET)

= STOP bit was not detected last

bit 3

S: START bit (I2C mode only) – This bit is cleared when the SSP module is disabled, or when

the STOP bit is detected last. SSPEN is cleared.

= Indicates that a START bit has been detected last (this bit is ‘0’ on RESET)

= START bit was not detected last

bit 2

R/W: Read/Write Information bit (I2C mode only) – This bit holds the R/W bit information follow-

ing the last address match. This bit is only valid from the address match to the next START bit,

STOP bit, or ACK bit.

=Read

= Write

bit 1

UA: Update Address bit (10-bit I2C mode only)

= Indicates that the user needs to update the address in the SSPADD register

= Address does not need to be updated

bit 0

BF: Buffer Full Status bit

Receive (SPI and I2C modes):

= Receive complete, SSPBUF is full

= Receive not complete, SSPBUF is empty

Transmit (I2C mode only):

= Transmit in progress, SSPBUF is full

= Transmit complete, SSPBUF is empty

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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