© 2004 Microchip Technology Inc. DS70067C-page 20-13
Section 20. Serial Peripheral Interface (SPI)
Serial Peripheral
Interface (SPI)
20
Figure 20-6: SPI Mode Timing (Slave Mode w/CKE = 1)
SCK Input
(CKP =
1
SCK Input
(CKP =
0
Input
Sample
SDI Input
bit7
bit0
SDO
bit7
bit6
bit5 bit4
bit3
bit2
bit1 bit0
SPIxIF
(SMP =
0
)
CKE =
1
)
CKE =
1
)
(SMP =
0
)
Write to
SPIxBUF
SPISR to
SPIRXB
SSx
(see Note 1)
SPITBF
SPIxRBF
Output
Note 1: The SSx pin must be used for Slave mode operation when CKE = 1.
2: When the SSEN (SPIxCON<7>) bit is set to ‘1’, the SSx
pin must be driven low so as to enable transmission and
reception in Slave mode.
3: Transmit data is held in SPIxTXB and SPITBF remains set until all bits are transmitted.
4: Operation for 8-bit mode shown. The 16-bit mode is similar.
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