25.4.7 SSPxCON3

MSSP Control Register 3

Note:

For daisy-chained SPI operation; allows the user to ignore all except the last received byte. SSPOV is still set when a new byte is received and BF = 1, but hardware continues to write the most recent byte to SSPxBUF.

Name:	SSPxCON3
Offset:	0x0192


Bit	7	6	5	4	3	2	1	0
	ACKTIM	PCIE	SCIE	BOEN	SDAHT	SBCDE	AHEN	DHEN
Access	R/HS/HC	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0

Bit 7 – ACKTIM

Acknowledge Time Status bit

Value	Name	Description
x	SPI or I²C Host	This bit is not used
1	I²C Client and AHEN = `1` or DHEN = `1`	Eighth falling edge of SCL has occurred and the ACK/NACK state is Active
0	I²C Client	ACK/NACK state is not Active. Transitions low on ninth rising edge of SCL.

Bit 6 – PCIE

Stop Condition Interrupt Enable bit

Value	Name	Description
x	SPI or SSPM = `1111` or `1110`	This bit is not used
1	SSPM ≠ `1111` and SSPM ≠ `1110`	Enable interrupt on detection of Stop condition
0	SSPM ≠ `1111` and SSPM ≠ `1110`	Stop detection interrupts are disabled

Bit 5 – SCIE Start Condition Interrupt Enable bit

Value	Name	Description
x	SPI or SSPM = `1111` or `1110`	This bit is not used
1	SSPM ≠ `1111` and SSPM ≠ `1110`	Enable interrupt on detection of Start condition
0	SSPM ≠ `1111` and SSPM ≠ `1110`	Start detection interrupts are disabled

Bit 4 – BOEN

Buffer Overwrite Enable bit⁽¹⁾

Value	Name	Description
1	SPI	SSPxBUF is updated every time a new data byte is available, ignoring the BF bit
0	SPI	If a new byte is receive with BF set then SSPOV is set and SSPxBUF is not updated
1	I²C	SSPxBUF is updated every time a new data byte is available, ignoring the SSPOV effect on updating the buffer
0	I²C	SSPxBUF is only updated when SSPOV is clear

Bit 3 – SDAHT SDA Hold Time Selection bit

Value	Name	Description
x	SPI	Not used in SPI mode
1	I²C	Minimum of 300 ns hold time on SDA after the falling edge of SCL
0	I²C	Minimum of 100 ns hold time on SDA after the falling edge of SCL

Bit 2 – SBCDE Client Mode Bus Collision Detect Enable bit

Unused in Host mode.

Value	Name	Description
x	SPI or I²C Host	This bit is not used
1	I²C Client	Bus Collision detection is enabled
0	I²C Client	Bus Collision detection is not enabled

Bit 1 – AHEN Address Hold Enable bit

Value	Name	Description
x	SPI or I²C Host	This bit is not used
1	I²C Client	Address hold is enabled. As a result, CKP is cleared after the eighth falling SCL edge of an address byte reception. Software must set the CKP bit to resume operation.
0	I²C Client	Address hold is not enabled

Bit 0 – DHEN Data Hold Enable bit

Value	Name	Description
x	SPI or I²C Host	This bit is not used
1	I²C Client	Data hold is enabled. As a result, CKP is cleared after the eighth falling SCL edge of a data byte reception. Software must set the CKP bit to resume operation.
0	I²C Client	Data hold is not enabled

For daisy-chained SPI operation; allows the user to ignore all except the last received byte. SSPOV is still set when a new byte is received and BF = 1, but hardware continues to write the most recent byte to SSPxBUF.

PIC16F15225/45