Datasheet

 1998-2013 Microchip Technology Inc. DS30289C-page 141
PIC17C7XX
FIGURE 15-8: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
FIGURE 15-9: SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
SDI
bit7
bit0
SDO bit7
bit6
bit5 bit4
bit3
bit2
bit1 bit0
SSPIF
Interrupt
(SMP = 0)
CKE = 0)
CKE = 0)
(SMP = 0)
Write to
SSPBUF
SSPSR to
SSPBUF
SS
Flag
optional
Next Q4 cycle
after Q2
SCK
(CKP = 1
SCK
(CKP = 0
Input
Sample
SDI
bit7
bit0
SDO
bit7
bit6
bit5 bit4
bit3
bit2
bit1 bit0
SSPIF
Interrupt
(SMP = 0)
CKE = 1)
CKE = 1)
(SMP = 0)
Write to
SSPBUF
SSPSR to
SSPBUF
SS
Flag
not optional
Next Q4 cycle
after Q2