Datasheet

 2010-2012 Microchip Technology Inc. DS41412F-page 263
PIC18(L)F2X/4XK22
REGISTER 15-4: SSPxCON3: SSPx CONTROL REGISTER 3
R-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
ACKTIM PCIE SCIE BOEN SDAHT SBCDE AHEN DHEN
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
bit 7 ACKTIM: Acknowledge Time Status bit (I
2
C mode only)
(3)
1 = Indicates the I
2
C bus is in an Acknowledge sequence, set on 8
th
falling edge of SCLx clock
0 = Not an Acknowledge sequence, cleared on 9
th
rising edge of SCLx clock
bit 6 PCIE: Stop Condition Interrupt Enable bit (I
2
C mode only)
1 = Enable interrupt on detection of Stop condition
0 = Stop detection interrupts are disabled
(2)
bit 5 SCIE: Start Condition Interrupt Enable bit (I
2
C mode only)
1 = Enable interrupt on detection of Start or Restart conditions
0 = Start detection interrupts are disabled
(2)
bit 4 BOEN: Buffer Overwrite Enable bit
In SPI Slave mode:
(1)
1 = SSPxBUF updates every time that a new data byte is shifted in ignoring the BF bit
0 = If new byte is received with BF bit of the SSPxSTAT register already set, SSPxOV bit of the
SSPxCON1 register is set, and the buffer is not updated
In I
2
C Master mode:
This bit is ignored.
In I
2
C Slave mode:
1 = SSPxBUF is updated and ACK is generated for a received address/data byte, ignoring the
state of the SSPxOV bit only if the BF bit = 0.
0 = SSPxBUF is only updated when SSPxOV is clear
bit 3 SDAHT: SDAx Hold Time Selection bit (I
2
C mode only)
1 = Minimum of 300 ns hold time on SDAx after the falling edge of SCLx
0 = Minimum of 100 ns hold time on SDAx after the falling edge of SCLx
bit 2 SBCDE: Slave Mode Bus Collision Detect Enable bit (I
2
C Slave mode only)
If on the rising edge of SCLx, SDAx is sampled low when the module is outputting a high state, the
BCLxIF bit of the PIR2 register is set, and bus goes idle
1 = Enable slave bus collision interrupts
0 = Slave bus collision interrupts are disabled
bit 1 AHEN: Address Hold Enable bit (I
2
C Slave mode only)
1 = Following the 8th falling edge of SCLx for a matching received address byte; CKP bit of the
SSPxCON1 register will be cleared and the SCLx will be held low.
0 = Address holding is disabled
Note 1: For daisy-chained SPI operation; allows the user to ignore all but the last received byte. SSPxOV is still
set when a new byte is received and BF = 1, but hardware continues to write the most recent byte to
SSPxBUF.
2: This bit has no effect in Slave modes for which Start and Stop condition detection is explicitly listed as
enabled.
3: The ACKTIM Status bit is active only when the AHEN bit or DHEN bit is set.